40+ Happy Birthday Wishes for Sister-in-Law

Birthday Wishes for Sister-in-Law: Does your sister-in-law deserve the great birthday you’re trying to make for her? Yes, I’m sure she does, and we got you covered. If she’s your husband’s/wife’s sister, you will find some messages about how lucky you are to marry a man/woman whose sister is wonderful. If she’s your brother’s wife, you can show how great your life and your brother’s life changed after her coming.

Happy Birthday to the best sister-in-law!

Anyway, birthday wishes for a sister-in-law should be super cool. We have prepared a big list of sincere, sweet and funny wishes for every sister-in-law. Let’s see.

Sweet / Funny / Brother’s Wife / Husband’s Sister / Wife’s Sister


Here are some lovely and cute Happy Birthday messages for a sister-in-law.

  • Happy Birthday, Sister-in-law! Beautiful and sweet forever.
  • Happy Birthday to a lovely sister-in-law, from a lovelier sister-in-law.
  • To the best sister-in-law ever, wishing you great health and long life. So you can always cook wonderful meals for us. Happy Birthday!

Happy Birthday to the most wonderful sister-in-law.

  • On this wonderful day, I just want to remind you, you are the prettiest sister-in-law. Happy Birthday!
  • It’s a beautiful day for a beautiful girl. I’m lucky to witness the moment my sister-in-law blows candles.
  • Happy Birthday to the lady who combines both beauty and style – my amazing sister-in-law.
  • Your words are always pleasing to the ear, appealing to the soul. It’s always lovely to be with you. Happy Birthday, sister-in-law!
  • My deepest wishes for you, sis. Now, let the candles make a volcano.
  • Happy Birthday, my sister-in-law! Do you know that time with you is inestimable and irresistible?
  • Happy Birthday to my sweet sister-in-law whose smile makes the day I see her one of the best days I spend in my life.
  • My sister-in-law deserves the most precious gifts on her birthday, doesn’t she?
  • Happy Birthday to one of the cutest girls I have ever known, my sister-in-law!
  • Raising a glass to the honor of my beautiful and poised sister-in-law.
  • Happy Birthday to that woman who totally changed my ideas about what the sister-in-law is.
  • We sometimes fight, but the day ends up talking at night. That’s my naughty sister-in-law who is going to have an awesome day.
  • Good moments and memories come in every one’s life, and you, sis-in-law, can easily create tons of memories. Happy B-day to you!

Happy Birthday to one of the cutest girls I have ever known, my sister-in-law!

  • Getting me out of feeling blue every time makes me want to celebrate you every day. Happy Birthday to the greatest sister-in-law!
  • You are my sister-in-law, but for me, you are my best friend to whom I share all my feelings, bad and good scenes of life, and you always put me first; it shows how much you care. Love you, sis & Happy Birthday!
  • The flowers, sun and stars say, my sister-in-law is one in thousands. Together forever, sis. Happy Birthday!
  • Tough like a nut on the outside, and sweet like a lollipop on the inside. Happy Birthday, Cool Sis-in-Law!
  • You are selfless, mature and I love you so much, I hope you enjoy this day to the fullest. Happy Birthday, dear!!

Related: Birthday Wishes for Sister


Here are some funny greetings for a sister-in-law celebrating her birthday.

  • Happy Birthday to the rare gem my brother found. I just wonder how that happened to someone like my brother.

Happy Birthday to the rare gem my brother found. I just wonder how that happened to someone like my brother.

  • Best birthday wishes to the lady who has a magic wand; look at my brother now, he is now responsible and smart unlike when he was a lazy jackass. Don’t tell him, please.
  • Best wishes to a powerful sister-in-law. Yes, living with that brother all these years proves that you’re surely powerful.

Brother’s Wife

If your sister-in-law is your brother’s wife, the following messages will be more specific.

  • Happy Birthday, Sister-in-law! May love fill your life with my bro.
  • Happy Birthday to my brother’s world, and the world’s best sister-in-law.
  • I’m so thankful for how much change you have brought into my brother’s life. Happy Birthday, my sweet sis-in-law!
  • You not only make my brother happy, you make all of us happy and we feel happy sharing your birthday with you. Happy Birthday!
  • Thank God life chose you for my brother, I wonder where someone like you has been all this while. Happy Birthday, sister-in-law!
  • The girl who tamed the monster is celebrating her birthday. That’s awesome.
  • Happy Birthday to my wonderful sister-in-law! You are the [little/big] sister I never had.
  • Happy Birthday to the lady who made my brother love marriage after years of rejecting it. Keep being the best.

Related: Birthday Wishes For Brother In Law

Husband’s Sister

If your sister-in-law is your husband’s sister, these messages may be perfect.

  • Happy Birthday to a cool girl, a great sister, and an all-round wonderful sister-in-law.
  • Sending birthday wishes to a joyful sister-in-law, you’re more joyful than your brother.
  • Happy Birthday to my sister-in-law whom I love to see and visit, even if without my husband.
  • If I’m to write a message about you, I would write two, because you doubled the happiness of my marriage by being my precious sister-in-law. Wishing you the best.
  • Happy Birthday, dear sis-in-law! I will never deny that your being in this family is a blessing.
  • Sending birthday wishes to my sister-in-law who has a positive influence on everyone in my new family. Love you, sis.
  • A beautiful girl like you surely deserves a grand birthday. Thanks for adding sweetness to my new life.

Wife’s Sister

Finally, if your sister-in-law is your wife’s sister, this list will do the job.

  • Happy Birthday to the aunt of my kids – my great sister-in-law.
  • Best birthday wishes to my sister who doesn’t have my genes, but has my wife’s genes.
  • It’s hard for a guy like me to find the best words for his sis-in-law, so I hope “Happy Birthday” is enough.
  • Happy Birthday, Sister-in-law! By the way, your nephews and nieces are wishing you the same.

Read Also: 300+ Birthday Wishes and Messages

Some marriages could have been saved by family members and friends just by a simple act of showing love, care and support. Unlike men who are a little rigid and less emotional, ladies love hearing from time to time how essential and indispensable they are. Your sister-in-Law is a great example, and her birthday is a great opportunity to tell her how beautiful she is and how great her impact on your family is. Birthday wishes for sister-in-law should be heart touching to leave a warm effect. Celebrate your sister-in-law and send her a sweet birthday message to spread love in your family.