If you're wishing your sister a happy birthday, use the sample messages below to inspire a creative, funny, and wholehearted wish she's sure to love.

Heartfelt Birthday Messages for Sister

The sentiments in this first list are touching and focus on just how much your sister means to you. Use them as a starting point and then add your own details about what makes your sister such an amazing friend, confidant, and family member.

Little sister, I'm so proud of everything you've accomplished—not only this year but since the day you were born. I hope you know how much you inspire me. Love you, and happy birthday!

Dear sister, I can't tell you how much you brighten my life! I'm so thankful that we've had so many years on this crazy planet together. Happy birthday, and here's to many, many more!

Happy birthday to the most thoughtful, graceful, and kind woman I know. Love you to the moon and back!

In good times and bad, one thing is for sure: I always know that you'll be on my side (regardless of whether I deserve it). I'm so grateful to have such a constant source of love, guidance, and support. Thank you and happy birthday, sister!

Dear big sister, I've spent my whole life looking up to you, and today I get to remind you just how special you are. Thank you for being you! Happy birthday.

Sis, I'm so impressed by your dedication and your resilience. You've been through a lot this year, but I know there's only good things to come. Happy birthday!

I don't tell you this enough, but it's your birthday, so I get to. You are an incredible woman—an amazing role model, a kind sister, and a true friend. Happy birthday to the best sister around!

Sister, I've copied you my entire life. But as much as I've tried, I've never quite mastered your charm, grace, or style. But I'll keep trying! Thank you for always being there for me and inspiring me to be my best. Happy birthday.

No one has a better sister than me! I can't tell you how special you are. Every challenge I face, I know that I can overcome it with your support. I appreciate you today and every day! Happy birthday.

Dear sister, I'm sending you my hugs from afar! Although we can't be together on your birthday, you're always in my heart. Let's video chat on your special day. Happy birthday!

Funny Birthday Wishes for Sister

There's always room for a little jest and sibling rivalry when it comes to a sister's birthday card. Tease your sister gently with these funny birthday wishes.

Happy birthday! I'm smiling because you're my sister, and I'm laughing because there's nothing you can do about it.

If life is a cookie, you're the chocolate chips! (And let's be honest, sometimes you're the raisins.) Lucky for you, I love you either way. Happy birthday!

Whenever I'm feeling old, I think to myself, "At least I'm not as old as [name]!" I just thought you'd be happy to hear that you brighten my day. Happy birthday, old lady!

Happy birthday, sis! I'd wish that all your dreams come true, but you already have me for a sister. Lucky you!

We may be two peas in a pod… but thank goodness, I'm the younger and less wrinkled pea. Happy birthday to a sister I can always count on to be older than me!

When we were young, you teased me for being younger. Now that we're older, how the tables have turned! Happy birthday to the most gracefully aging sister I know.

Who needs a therapist when you have a sister? (Yeah, okay. I need a therapist.) Until then, I have you! Happy birthday!

Happy birthday to the responsible and mature (AKA BORING) woman who always keeps me in line. Just kidding! I'm grateful for your advice and support for so many years. Love you!

Happy, happy birthday to the bossiest (and best!) girl I know. Let's celebrate you today, little sister!

Okay, okay. We all know that no one shines as bright as you—but don't let it get to your head. Happy birthday to my shining star of a sister!

You know why I'm the best sister in the whole world? It's because I remember your birthday but never your age. Happy bday!

Inspiring Birthday Wishes for Sister

Whether your sister has been going through a challenging time or you are just looking to propel her even further down her life's journey, a few motivational words can make for a truly touching birthday card. Try one of these phrases out:

Welcome to another year of life! I've watched you accomplish so much over the last year, and I'm so excited to celebrate a day of YOU. Happy birthday!

Happy birthday, sister! You've worked so hard this last year, and I've been so proud of everything you've accomplished. I know that this year will be the best yet. Love you!

Little sister, you've accomplished so much that there's not much left for the rest of us! I hope this small gift helps you on your journey. Please know that I am here to help you and to be your cheerleader as you take on the many challenges of the next year. Love you and happy birthday!

Dear little sister, you amaze me! The tougher things get, the more you dig in—and you always find a way. I'm constantly impressed by what you accomplish and can't wait to see what's next. Happy birthday!

Happy birthday to the best sister and friend I've ever had. I can't tell you how much I appreciate your intelligence, honesty, and wit. I know that this next year, you'll go even further. Let's celebrate you today!

Dear sister, I know life has been exhausting recently, but I also know you've got this! You've gotten through so much already, and you're almost to the finish line. We're all cheering for you. Happy birthday!

I can't tell you how much I love watching you grow and do amazing things. Seeing you reach so many goals inspires me every day. Happy birthday! I hope you can take a day off to enjoy yourself and recharge.

Dear sister, I'm so proud of you! I can't tell you how much you inspire me and how grateful I am to have you as a role model. With your determination and can-do spirit, I am confident that you'll achieve your dreams in the year to come. And I'll be right there to cheer you on! Happy birthday.

I can say with confidence that the best is yet to come! We have so much to look forward to this year, and I'm so excited to help you bring in this new year of your life. Happy birthday to the best big sister around.

To my beautiful sister, I'm sending you the biggest hugs and the biggest birthday wishes! I can't wait to celebrate your birthday together and to see all of the amazing things you do in the year to come. Happy, happy birthday!

Belated Birthday Wishes for Sister

If your sister's birthday card is going to be just a little late, use one of these belated birthday wishes! And don't let the tardiness keep you from sending a card at all. "Better late than never" definitely applies to your sister's birthday card.

Hey sis! Happy belated birthday. I hate that this card will arrive late, but at least you'll have an extra surprise smile on me. Love ya!

A birthday card is just like your age…it only gets better with time. At least that's what I say! Sorry for the late card. Love you and happy birthday!

You're my little sister, and this card is litttttle late. I just wanted to make things match. Happy birthday!

I'd make an excuse for my card being late, but I can't think of a good one. So let's just stick to, "Happy birthday, sister!" Love you so much!

I know, I know. ANOTHER late birthday card?! I just wanted to keep up the tradition. Happy birthday to the sister who always forgives my lack of planning!

Bonus: Thoughtful Quotes to Include in Your Birthday Card for Sister

While you're writing your birthday card, why not add a quote? The perfect quote can make your own creative message that much better.

"A sister can be seen as someone who is both ourselves and very much not ourselves—a special kind of double." — Toni Morrison

"A sister smiles when one tells one's stories—for she knows where the decoration has been added." — Chris Montaigne

"Sisters make the best friends in the world." — Marilyn Monroe

"Sisters are different flowers from the same garden." — Anonymous

"Is solace anywhere more comforting than that in the arms of a sister?" — Alice Walker

"You know full well as I do the value of sisters' affections; there is nothing like it in this world." — Charlotte Brontë

Ready to write your sister's birthday message? Start by checking out Foxdog's birthday cards! You can choose a creative card, write your kind birthday wish, and have us send it right to your sister's doorstep.