150+ Ways to Say "Happy Birthday, Sister"

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Relationships

Updated 07/27/2023

Published 03/6/2020

Belinda McLeod, BA in Secondary Education

Contributing writer

Author bio

Jump ahead to these sections:

Funny Birthday Messages for a Sister or Sister-in-Law
Sweet Birthday Messages for a Sister or Sister-in-Law
Heartfelt Birthday Messages for a Sister or Sister-in-Law
Birthday Messages for a Sister and Best Friend
Birthday Messages for a Big Sister
Birthday Messages for a Little Sister
Birthday Messages for a Twin Sister
Happy Birthday Messages for a Step-Sister
Happy Birthday Quotes for a Sister or Sister-in-Law
Happy Birthday Social Media Posts for a Sister or Sister-in-Law

Here are some ideas for how to say “happy birthday” to your sister or sister-in-law. Some of the messages are humorous and will make your sister laugh. Others will help you express how much your sister means to you. Some, you might even want to use to pay tribute to a sister who died.

No matter which messages you pick and choose for your inspiration, just make sure you speak from the heart!

Funny ‘Happy Birthday’ Messages for a Sister or Sister-in-Law

Most of the time, if you can be funny or sarcastic with your sister, that means you have a close relationship. Here are some amusing messages for your sister as she celebrates her special day.

I smile because you are my sister. I laugh because there is nothing you can do about it. Happy birthday, sis!
Happy birthday to Mom’s second favorite child!
Sisters are a lot like sprinkles on top of an ice cream sundae. You can get by without them, but what would be the fun in that?
Having a sister as awesome as me is the only present you need.
Happy birthday, sister! You look exactly the same...except older.
Guess what? You're one year closer to eternity! Happy Birthday!
Happy birthday to a wonderful person who has questionable judgment in men. (Sorry, brother! But you know you married up.)
You are sweeter than cake and better than pie, but let's face it, we're all just here for dessert! Happy Birthday!
True or False: Age is just a number. False! Age is a word. Happy Birthday!
You're how old?? Quick! Blow out the candles before the fire alarm goes off!
Happy birthday to the person who needs wrinkle cream before I do!
When I was two I wanted a brother. All Mom brought back from the hospital was a lousy sister. (I'm so glad she did!)
Happy Birthday, Sis! You're one step closer to getting senior discounts!
You know, you should really be thanking me for today. I'm the one who asked for a sister!
Did you know... In an alternate dimension, you're still young! Happy Birthday!

Sweet Birthday Messages for a Sister or Sister-in-Law

Life is too short! It's important to tell others what they mean to you whenever you have the opportunity. Here are some sweet birthday messages to share with your sister while wishing her good health and happiness.

I can’t imagine going through life without you, sister! You were my role model when I was young, and you continue to be the person that I most admire! Happiest of birthdays to you, special lady!
Happy Birthday! Even though you aren’t officially my sister-in-law yet, I am lucky to call you my friend!
You are my sunshine, sister! Every time I see you, you brighten my day. I love you! Happy Birthday!
Life wouldn’t be nearly as fun without you in it! Happy Birthday, sister!
Sister, there are so many things I admire about you – including your patience, your beauty, and your zest for life! Happy birthday to my amazing sister! I love you so much!
I hope my brother treats you like a queen today! You truly deserve it! Happy birthday to you, dearest sister-in-law!
Happy birthday to my sister-in-law who chose to be part of our family. We are so happy you did!
I don’t tell you this enough, but I am so thankful you are a part of our family! We love you! Happy Birthday!
Hooray! It’s your birthday! I hope my brother and the kids spoil you like crazy!
Wishing the happiest of birthdays to the sweetest of sisters a girl could ask for.
Happy, happy birthday, sis! May you get to enjoy all of your favorite things today.
You are the best present any of us could wish for. Happy birthday to the best sister-in-law around!
Here me raising a glass to the best sister I could have hoped for! Happy Birthday!
Happy birthday to my adventurous partner-in-crime, sister-in-law, and friend.
You make life sweeter, richer, better, and brighter just by being in it. Happy Birthday!

Heartfelt Birthday Messages for a Sister or Sister-in-Law

Pull out all the stops and write a heartfelt message to make your sister or sister-in-law feel all the feels on her special day. You could even have part of a phrase engraved on a special gift! Here are some heartfelt birthday messages to get you started.

Today, and every day, may you have every possible reason to smile! Happy Birthday!
I hope you know that my thoughts are always with you – no matter how far apart we are! I love you, sis. Happy Birthday!
You bring so much joy to people’s lives. I hope today and every day is filled with the same happiness you bring us!
Every day is a great day to celebrate the best gift I've ever been given - you! Wishing the happiest of birthdays to the best of sisters!
I am so grateful that God gave me you for a sister! There couldn't be a better sister in all the world.
I am so lucky to have the best, most beautiful, kind-hearted, wonderful sister in the world! Happy birthday, sissy!
I am so excited to finally say this — ‘Happy birthday to my sister (in-law)’! I have wanted a sister all of my life! You were worth the wait!
I couldn't imagine life without my sister, confidant, protector, and partner. Happy Birthday!
You bring sunshine, joy, and life to every room you walk into. Thank you for being so awesome. Happy Birthday!
Happy Birthday to the best role model a girl could ever wish for.
To the one who is always down for a fun and fantastic adventure: Happy Birthday! May this year be filled with even more memories!
I know I may not always say it, but I want you to know that I am so thankful to have you by my side. I couldn't imagine this world without you in it. Happy Birthday, Sis!
Wishing you all of the very best things on this special day when we get to celebrate you!
I am so thankful to have you in my life, sis. You are a blessing to me and to all who know you.
Happy, happy birthday to the gal who made me a sister and the best friend a girl could ever want.

Birthday Messages for a Sister and Best Friend

The combination of best friend and sister is a force that can’t be matched. If you’re lucky enough to enjoy this close-knit relationship, celebrate it! Send one of these messages through text, a card, or even in an appreciation letter on her special day.

Happy birthday to my ride-or-die, bestie, my sister, my love! I can’t imagine life without you!
Sorry for the midnight text, but I wanted to be first to wish you a happy birthday!
I know we’re spending the day together and we already spoke on the phone, but I wanted to let you know I love you so much! I hope you have a glorious birthday!
I know that we don’t agree on everything, but you’re still my best friend AND sister. I’ll be there for you forever — even if you are dumb sometimes.
Happy birthday to the person who knows me better than anyone else in the world.
Happy birthday, sister! I believe this year will bring wonderful things to your life!
Happy 50th! I can’t wait to see what adventures are waiting for us as we enter the next decade of life!
Happy birthday to the best sister and friend I could have hoped for. You are the best thing that's ever happened to me!
Wishing my best friend and sister the best birthday ever! Let's go do something crazy!
To my sister, mischief maker, partner-in-crime, and best friend. Happy Birthday!
Here's to an entire day of celebrating the best thing in life - YOU! Happy Birthday, Sis!
Cheers to my sister and best friend!
Happy Birthday, Sis! I'm so thankful we get to celebrate your special day together.
Here's wishing a happy birthday to the best sister on planet earth!
It might be your birthday, but you are a gift to me!

‘Happy Birthday’ Messages for a Big Sister

Older sisters are special, especially if they take the time to help you through life. Maybe your older sister was the one who taught you to put on makeup or drive a car. Perhaps she gave you advice on how to handle your parents or get through high school.

Whether you gently tease your sister about her age, include a poem about aging, or simply wish her a fantastic day, use these ideas to get you started.

Happy birthday, sister! When I was little, I looked up to you as my role model. Now that I’m older...nothing has changed.
Remember, no matter where you go or what you do, you will always be older than me. Happy birthday to my older sister!
Even though we are very different, we will still always be sisters. I love you dearly! Happy Birthday!
Happy birthday, sister! You are so smart, pretty, and vivacious (for your age.)
Happy birthday, sister, from the exact same mister!
Happy birthday to an oldie but goodie!
You may be older, but I didn't say anything about being wiser! Just kidding! Happy Birthday!
Sis, I've always looked up to you. Now that we're older, I still do. Happy Birthday!
Happy birthday to the one who will always make me feel young.
Thanks for always taking me under your wing and showing me how to rock this life. Happy Birthday!
I always look up to you, Sis. No really, I do. I mean, you are three inches taller than I am. Happy Birthday!
You're the sister everyone else wished they had. I'm so thankful for you. Happy Birthday!
I'm so thankful for your life, your love, and your friendship. Happy Birthday, Sis!
Happy birthday to the best big sis ever!
Sis, you deserve the best! Happy birthday to the most wonderful person I know.

‘Happy Birthday’ Messages for a Little Sister

It’s your little sister’s birthday! Even though you may think that she gets all the attention in the family, take time to send her a sweet birthday message. It’s important to tell others how we feel about them. In fact, maybe that should be a part of your birthday resolutions this year -- to say to others that you love them. Can you think of a better resolution than that? Here are some phrases to inspire you.

Happy birthday, little sister! You aren’t nearly as annoying as you used to be!
Dear sister, I know there have been times when I have teased you, pestered you, and told on you. But I want to tell you that I think you are an amazing person. Happy birthday to the best little sister a girl could have. I love you!
Happy birthday, sister! I know mom and dad were worried, but I guess you turned out all right in the end.
Happy birthday, sister! I loved you yesterday, and I love you still. I always have, and I always will.
With each passing year, you shine a little brighter! Happy birthday to my little sister!
Today, I celebrate a gift that I was given 29 years ago - YOU!
Sis, even though I wanted a puppy, Mom and Dad brought you home, instead. I think they made a pretty good choice!
Thanks for being a great sister and a wonderful human being. I'm so proud of who you've become!
You are a beautiful young woman and I'm so proud of you. Here's wishing a happy birthday to the best little sis around!
When Mom and Dad brought you home, they told me you were my sister. I didn't know you'd also become my friend. Happy Birthday!
Dress up fancy, put on your make-up, and slide on your dancing shoes because we're going out to celebrate you!
Happy birthday, little sis! God gave our family a gift when you were brought into this world.
Happy birthday to a great sister and an awesome friend!
Today is all about you! Let's celebrate in style and hit your favorite places!
Thanks for making me a big sister! Happy Birthday!

Birthday Messages for a Twin Sister

Do twins even have to wish each other a happy birthday? Can't they just communicate their message using twin ESP? Maybe not. Just in case, here are some birthday messages to share with your twin sister.

Happy birthday to us! Happy birthday to us! I’m lucky to have you! Happy birthday to us!
Happy birthday to my older sister! You may only be older by four minutes, but you are still older than me!
You can always depend on me to NOT forget your birthday! Happy birthday, dear sister!
Even if we weren’t identical twins, you would still be my best friend in the world. Happy birthday, sister!
Happy birthday to the other pea in my pod!
Hey sis! Have you ever wondered if Mom or Dad could have accidentally mixed us up when we were infants? Maybe I’m you, and you are me! Oh well, happy birthday!
There’s no one else in the world I would rather share this special day with than you! Happy birthday to my twin sister!
Let's eat two slices of cake and celebrate twice as much!
Happy Birthday to my womb-mate! There's no one else I'd rather share a womb, a room, or a birthday with than you!
Sharing a birthday with you is way better than having to celebrate solo. Happy birthday to my other half!
The best things in life come in twos. I should know because I have you! Happy Birthday!
Happiest of birthdays to my little sister. Hey, you know I'll always be two minutes older!
Today is a great day to have a birthday party. I've always thought so. Haven't you?
I'm so thankful that I wasn't just given a sister, but I was also given a friend.
Happy birthday to the one who can read me like a book and tell me what I'm thinking. You're the best!

Happy Birthday Messages for a Step-Sister

Hollywood seems to love portraying stepmothers and stepsisters as evil. But, chances are, your step-sister isn’t trying to squeeze her giant foot into your glass slipper.Here are some ways to say happy birthday to a sister from another mister (or misses).

Happy birthday to the best step-sister in the world! I am so happy you are a part of my life!
Happy birthday! I wish I could be there to celebrate with you, but we will have to have our own party when I visit next month.
Even though our relationship had a rocky start, I am thankful that you are my step-sister. I’m looking forward to celebrating with you for years to come.
Happy birthday to my surprise little sister! Even though you stole my role as the baby in the family, I am thankful for you every day.
Happy birthday, sister! I love you!
Happy birthday to the world’s coolest step-sister. My coolness factor increases tenfold when I’m with you!
We are sisters by chance but friends by choice! I hope you have a great birthday!
Happy birthday, sis! Can’t wait to celebrate with you!
You are the bonus sister I never expected and the greatest gift I've ever been given.
Happy Birthday to the best step-sister a girl could ask for.
Sis, our family stepped up when you joined it. Maybe that's why you're called a step-sister. Happy birthday to the gal who makes our family ten times better!
Happy Birthday to the best step-sister and friend ever!
You are a gift to everyone who knows you, sis! Happy Birthday!
Hope today is filled with all the things you love the most! Happy Birthday!
Wishing you a happy birthday and a wonderful new year filled with fun and excitement!

Happy Birthday Quotes for a Sister or Sister-in-Law

Sometimes it’s just easier to turn to a quote instead of coming up with a clever saying on your own. Here are some perfect quotes to add to a card or send on their own while wishing your sister or sister-in-law a happy birthday.

“Sisterhood is Powerful” by Robin Morgan
“For there is no friend like a sister/ In calm or stormy weather/ To cheer one on the tedious way/ To fetch one if one goes astray/ To lift one if one totters down/ To strengthen while one stands.” by Christina Rossetti
“Sisters are different flowers from the same garden.” by Unknown
“A sister can be seen as someone who is both ourselves and very much not ourselves – a special kind of double.” by Toni Morrison
“A sister is both your mirror—and your opposite." by Elizabeth Fishel
“Sisters are friends we have for a lifetime.” by Catherine Pulsifer
“Your sister is a jewel, a priceless, one-of-a-kind gem who makes living precious for many people, including you.” by Dave Pipitone
“A sister smiles when one tells stories—for she knows where the decoration has been added." by Chris Montaigne
“A sister is a gift to the heart, a friend to the spirit, a golden thread to the meaning of life.” by Isadora James
“A sister is a little bit of childhood that can never be lost." by Marion C. Garretty
“Sisters make the best friends in the world.” by Marilyn Monroe
“Having a sister is like having a best friend you can't get rid of. You know whatever you do, they'll still be there." by Amy Li
“When sisters stand shoulder to shoulder, who stands a chance against us?” by Pam Brown
“You can kid the world, but not your sister.” by Charlotte Gray
“How do people make it through life without a sister?” by Sara Corpening

Happy Birthday Social Media Posts for a Sister or Sister in Law

Want a message just for social media? Maybe you don't have time to send a card. Or maybe you're too far away but you miss your sister on her birthday. Maybe you just want another way to send your sister love. No matter why you want to send a social media birthday greeting, these ideas should get you started.

My sister isn’t on Facebook. But since I’m friends with many of the people she interacts with daily, I wanted to remind you all that today is her birthday! (And it’s a BIG one!) If you see her, wish her a happy day!
Happy birthday to my amazing sister and best friend!
Thirty-eight years ago today, my mom went to the hospital. As she was leaving, she told me that she would bring back a present for me. I couldn’t wait to see what it was! Imagine my disappointment when she brought home a dumb baby. It took me a few years, but now I understand that I received one of the best gifts of my life that day. I love you, sister! Happy Birthday!
Happy birthday to you! Happy birthday to you! Happy birthday, dear sister! Happy birthday to you!
Happy birthday to one of the biggest blessings in my life! I love you, sister!
Your friends are so rude! I can’t believe they wrote all those things on your Facebook page yesterday about how you are getting older! I bet you wish they were all like me, who chose to ignore your birthday completely!
Please join me in wishing the happiest of birthdays to the best of sisters! Happy Birthday, Sis!
Happy birthday to the best sister-in-law and friend a girl could ask for! You are loved, appreciated, and admired more than you know.
Happy birthday to the gift Mom and Dad brought home from the hospital instead of the rabbit I wanted!
Wishing a fabulous day to a fabulous sister! Happy Birthday!
Happy birthday to the gal who has been at my side for the last three decades!
Hope you have the best day ever, today! Live and laugh it up. Happy Birthday!
Hey Sis! Can't wait to celebrate your birthday together soon. Eat an extra piece of cake for me today!
Celebrating your birthday from afar, sweet Sis! Sending you lots of love and hugs and Amazon packages!
To my wonderful Sister-in-Law: Happy Birthday! You deserve a day full of happiness and joy!

Wishing Your Sister a Happy Birthday

Wishing your sister or sister-in-law a happy birthday can be accomplished in all sorts of ways. Send a card, shout her out on social media, send a text, or throw a party. Whether you make it funny, sweet, heartfelt, or extra special, she is sure to appreciate your wishes.

150+ Ways to Say "Happy Birthday, Sister" | Cake Blog (2024)