A sister is your first best friend, your fiercest critic and the one person who remembers every embarrassing thing you ever did — and loves you anyway. Whether she's older, younger, a twin or a sister-in-law who feels like the real thing, here are birthday wishes for your sister to suit every mood: sentimental, short and sweet, or properly funny.
Heartfelt birthday wishes for your sister
These emotional birthday messages for a sister are for the moments when you want her to know exactly how much she means to you.
Happy birthday to my sister, my best friend and my favourite person to laugh with. Life is so much better with you in it.
We've shared a bedroom, a bathroom, a hundred arguments and a million laughs. I wouldn't swap a single one. Happy birthday, sis.
Sister, you know me better than anyone, and you're still on my side. Thank you for always being there. Happy birthday!
No matter how far apart we live, you'll always be just a phone call away from my heart. Have the most wonderful birthday.
Happy birthday to the person who made my childhood brighter and my adult life a lot less lonely. Love you endlessly.
You were my first friend and you're still my best one. Wishing you a year as kind, funny and brilliant as you are.
Thank you for every secret kept, every borrowed jumper returned (eventually) and every time you had my back. Happy birthday, sister.
Watching you grow into the amazing woman you are today has been one of the joys of my life. Happy birthday — I'm so proud of you.
Short birthday messages for your sister
Perfect for texts, WhatsApp or a quick note on a present, these short birthday wishes for a sister are short but full of love.
Happy birthday, sis! Love you loads. x
Happy birthday to my partner in crime!
Cheers to the best sister in the world. Have an amazing day!
Happy birthday to my favourite sibling. (Don't tell the others.)
Wishing my wonderful sister the happiest of birthdays.
Sis, you're one in a million. Happy birthday!
Happy birthday! Let's celebrate properly this weekend.
Another year older, still my favourite. Happy birthday!
Funny birthday messages for your sister
Siblings speak fluent sarcasm. These funny birthday wishes for a sister are for the sister who'll laugh first and hug you later.
Happy birthday to my sister! Thanks for being the reason Mum and Dad think I'm the sensible one.
Happy birthday, sis! Don't worry about getting older — I'll always be younger and better-looking.
I'd tell you an embarrassing story from our childhood, but I'm saving them all for your wedding speech. Happy birthday!
You're officially old enough to know better. Happy birthday — please continue not knowing better.
Happy birthday to the sister who stole my clothes, my sweets and my spotlight. I've forgiven you. Mostly.
Thanks for sharing your genes with me. Clearly I got the good ones. Happy birthday!
Happy birthday! Let's celebrate with cake, wine and stories Mum doesn't need to know about.
Longer birthday messages for your sister's card
For a milestone birthday or a card you know she'll keep, a longer birthday message for your sister says what you might not manage out loud.
Sis, I don't think I ever properly thanked you for all the times you looked out for me — at school, at family parties, and in all the years since. You've been my safety net more times than you know. Today I want you to feel as loved as you make everyone else feel. Have the most brilliant birthday, and here's to many more years of late-night chats and laughing until we cry.
When we were little, I thought you were the coolest person in the world. Years later, I still do — I've just learned to hide it better. You're kind, brave and ridiculously funny, and I'm so lucky to call you my sister. I hope this year brings you everything you've been working towards and plenty of moments to just enjoy life.
Happy birthday to the person who knows all my stories because she was there for most of them. Whatever this year brings, I'll be cheering you on from the front row. Thank you for being my sister and my friend.
Birthday wishes for an older or younger sister
For an older sister
Happy birthday to the sister who paved the way and took all the telling-offs first. I owe you one. Or several.
You were my role model before I knew what the word meant. Thank you for showing me how it's done. Happy birthday, big sis.
Thank you for always looking out for me, even when I didn't want you to. Happy birthday to the best big sister ever.
Older, wiser and still my hero. Happy birthday!
For a younger sister
Happy birthday to my little sister, who isn't so little any more. I'm so proud of the woman you've become.
I used to get annoyed when you followed me everywhere. Now I'd follow you anywhere. Happy birthday, little sis.
You'll always be my baby sister, no matter how grown-up you get. Wishing you the most amazing year.
Happy birthday to the youngest, the cheekiest and the most spoilt. Love you to bits.
How to make your sister's birthday special
- Bring back a childhood memory. A photo from your old holidays, your favourite sweets as kids or a nickname only you use will make her smile.
- Plan something together. Shared time — a spa day, a takeaway and a film, a weekend away — means more than any present.
- Make it personal. Write a list of "things I love about my sister" or record a short video message with friends and family.
- Get the gift right. Need inspiration? Our gift ideas have something for every budget.
For more birthday words, see our birthday wishes for Mum, messages for your best friend and the full collection of birthday wishes.
