One of the best and most enjoyable feelings in the world is celebrating your sister’s birthday. Whether you are looking to have an amazing time with your family and friends or are simply looking to send a nice card to your sister, these 11th birthday wishes for sister can come in handy.

Happy 11th Birthday Wishes For Sister

1. Hi my darling sister. It’s your big day and I want to make it as special as possible! You mean the world to me, and I am so happy to celebrate 11 years with you. You are one of my best friends and I love you so much. I hope you have an amazing day and you get everything you wished for!
2. I can’t believe you are already 11 years old! You are a young lady now, but I still treasure the sisterly moments we share. Your laugh makes me giggle, your smile brightens my day, and your smile warms my heart. Every time I see you I realize how very much I love you and miss you. I can hardly wait for the day when we can be together again. You and mom always bring a special light to my life. Love always.
3. Dear sister, I am writing this letter to tell you how much you mean to me and how grateful I am for having you in my life. I love the bond we share that makes us inseparable. We complete each other. Happy 11th Birthday!
4. HAPPY 11TH BIRTHDAY to my best friend, my sister, my queen. I don’t know what I would have done without you in my life. We have many memories and adventures together and I look forward to many more. You are the cutest little 11 year-old that always makes me laugh and puts a smile on my face. I hope your day is magical and filled with all the sweets you could ever dream of! Love you.
5. Happy 11th birthday to my sister, my best friend. Hopefully today is an excellent one for you, a day of firsts are ahead for you. I can’t wait to officially be your big sister. I know we’re going to have so much fun together and always be there for each other. Congratulations! I love you and hope this is the best birthday you’ve ever had.
6. I don’t know how you did it, but somehow over 11 years you became the most wonderful, loving and caring girl in the whole entire world. I’m serious! I couldn’t have asked for a better sister to share my life and all of my crazy adventures with. You are always there to support me through everything, even when I create chaos. The older I get, the more I just keep thinking… wow! You see me at my worst and still you love me! Happy birthday sis.
7. Sister, I’m so happy to be celebrating your 11th birthday today. I love you so much and hope you have an amazing day! Happy Birthday!
8. Happy birthday to the best sister ever in the whole world. I can’t imagine my life without you because you bring me so much joy and your unconditional love is a blessing. Happy 11th birthday and I love you!
9. Dear, I am your brother and today you are turning 11. You are young and beautiful I love you very much. Your smile is so beautiful and your eyes are so clear. I want to say happy birthday to you.
10. To my sister on her 11th birthday, I wish you to be happy. I want nothing but the best for you and my life is better just by being near you! You have grown into a fine young lady and I hope that you are proud of who you are and where you will let your life take you. Even though we fight, as sisters are apt to do, I’m glad that I have such a strong and such a wonderful big sister. I love you!
11. I am writing this to you on your eleventh birthday, to tell you I love you and hope you have a wonderful day. You are a beautiful little girl who is going to grow up and be beautiful young lady! Remember that we all love you very much!
12. Happy 11th birthday to my dearest sister. I am so proud to call you my sister because you are an amazing person and that is why I love you so much. I seriously could not have asked for a better sister in the whole wide world. You deserve everything that comes your way because even though you may have had it hard, you have done amazing! Have the best birthday ever!
13. You are a marvelous human being and I’m so happy to be your sister. Sending you the biggest birthday hug in the universe! Happy 11th birthday.
14. Wish you a very HAPPY 11TH BIRTHDAY! May this day be filled with joy, laughter and delight? Enjoy your special day to the fullest and have a very memorable celebration. Happy Birthday!!
15. Happy 11th birthday sis. You are one of the best friends to have, always there when I need you. You’re funny, pretty, and the nicest person ever. I wish you good luck in all you do! I hope you have a wonderful birthday!!
16. Silly but wise. Funny and playful, warm and kind. Consistent and patient, thoughtful and smart. I love you! Happy 11th birthday sis!
17. Dear sister, I know I’m not the best sister at times. But, I really do love you and want the best for you. I hope you have a great day! Happy 11th birthday.
18. Happy 11th birthday. You make me smile, laugh, and even challenge me in ways that no one else could. It is great to be able to count on you when I am going through hard times. You are such a positive influence in my life. My sister is the best!
19. Sister, you are my favorite person in the world and I will never stop loving you. I hope to make you proud because I know how hard you have worked for me. You will always be my hero no matter what. Happy 11th birthday.
20. Happy 11th Birthday to a wonderful sister. I hope your day is filled with fun, cake, and happiness. As the sun sets on your eleventh year as a human being, I wish you the best birthday you’ve ever had. Love, your loving brother.
21. Dear, when I was a kid i asked for a sister. Then I grew up and you came along. This is the perfect birthday for you, because it’s your first birthday as my sister. I love you so much. Things will be different from now on because we will share everything; clothes, friends and family. You are always at my side, no matter what we are doing. Happy 11th birthday to my dearest sister!
22. Dearest Sissy, you are now entering into the magic world of tweendom. You’re 11 years old! Wow, where did our time go? I am so proud of you; my little baby sister is becoming a young lady. I love you so much and remember always that I will be here for you whenever you need.
23. Thank you for being my sister, my friend and for always being there for me. I don’t know what I’d do without you. I know it seems like everything has been changing but we will always be there for each other. You make me smile when things aren’t going my way and sometimes you get to take all the mean stuff that happens at school or home but I appreciate it. You are very beautiful, caring and loving. Happy birthday sis.
24. Today’s your 11th birthday and I can’t believe how fast the past ten years have gone. You are my best friend, my shoulder to cry on, my go to when I need advice, and the one I turn to for anything. No matter what happens in life as long as we have each other we will always be okay.
25. You got the whole world in your hands. Open it up and share it with all the people you love. I know we had a rough childhood, but now the future is yours. Open the books, open your mind, step outside and if you cannot find a friend then make one. Don’t use your time struggling alone, call me and talk to me or anyone else who understands you and if they can’t help find someone who can! Have an amazing 11th birthday sis.
26. Today, it is I who wishes a happy 11th birthday, to MY BFF! The one person in the world that I share all my thoughts with, goals with, dreams and fears with… If someone doesn’t love you as much as I do, they don’t deserve to love you at all. Happy birthday sister.
27. Happy 11th birthday. You are my sister and I love you so much. I don’t care if you annoy me or make fun of me, because it means we still get to talk. I love your voice and when you ask me to sing with you. You brighten my day no matter what and even when your torture is getting to the point where I might have to have a heart attack at 8:00 am on a school day, I love you.
28. Happy 11th birthday sister. A sister thinks of you and smiles, a sister is happy to be yours, a sister thinks you are nice, a sister likes taking your side, a sister thinks you are the greatest person in the world.
29. We are at our 11th birthday party and I want you to know how much I love you on our birthday. You are my beautiful, artistic and funny sister. I know you will have a wonderful life filled with love, music and of course art. Happy birthday!
30. Happy 11th birthday! You’re almost as tall as I am. Wow! You are the sweetest sister in the world. I love you so much. Happy 11th birthday, have a wonderful day, and many more to come!
31. Sister, I just want you to know how much your support has meant through my younger years and even now. You’ve always been there for me no matter what I’ve needed. Even after all of the mistakes I’ve made, you have stood by me and told me it was okay. I love you more than words could ever explain. I hope that your 11th year brings nothing but happiness and joy!
32. Happy Birthday from your favorite brother! I know, it’s been a hard 11 years. Birthdays, holidays and every day in between. You’re not just my sister, you’re my best friend as well! I wouldn’t trade you for the world. Have a great one and I hope your day is filled with smiles, laughter and love. I love you bunches sis.
33. I’m so proud to be your big sister. Ten times more than last year! You have grown more mature and kind, also so smart! I’m impressed at how well you do schoolwork, art, media & sports! I hope your 11th birthday is as wonderful as you are.
34. I wish I could just go back to when we were little girls and sleep over at your house, waking up in the morning to a big breakfast while the whole house smelled of pancakes and eggs. Those were good times, but we are both growing up so fast. I know we will have many more fun times in our future, but I wish you would just stay 11 forever!
35. It has been 11 whole years since the day that you were born. As I watch you grow, I realize how much of an impact you’ve had on my life and how much more amazing it’s going to be. It is amazing to think that out of all the beautiful girls in the world I was lucky enough to get a sister like you!
36. HAPPY 11th BIRTHDAY, I hope you feel really special right now! I love you. Always remember that we are a team, and always need to be there for each other. I want to be your best friend, I want us to kiss more often, and I just want us to have fun together. You mean the world to me. Thank you so much!
37. If i had a million wishes for you, it still would be less than what i feel for you. You’re such a special sister. Happy 11th birthday.