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Birthday Cards for Sister

Browse our collection of birthday cards for sisters! What relationship in your life is more special than the one you share with your sister? No matter what stage of life you are both in, whether she is older, younger or even a twin, we have the perfect card to express your heartfelt birthday wishes. Our birthday cards for sisters cover the gamut from sweet and sentimental to funny and sarcastic.

We offer cards for milestone birthdays, pretty cards, sentimental cards, trendy cards, humorous cards and cards that can be customized to say just what you want. You can even add a picture to make your card truly one-of-a-kind. Don't settle for another generic card off the rack, create a personalized card that she'll cherish as a keepsake for years to come! Once you find the perfect birthday card for your sister, we'll print and mail it the next day!
Birthday Cards for Sister

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Shopper Testimonials
“I have used Greeting Card Universe (GCU) for quite some time. It is a pleasure to write a review for them. The website is the best of the sites I have seen, which are similar to GCU. I have found a card -- every time -- for-every- reason that I've needed. Thank you for the great card! Anthony”
Anthony - Nov 2nd, 2026
“Darling card and very appealing to a young child. Quality card with nice envelope.”
JUDITH - Nov 2nd, 2026
Cards per Page:
Cards: 4,840 Pages: 162
Most Popular Newest Show adult cards
Birthday Heart of Flowers for a Sweet Sister on he…
4th Birthday Little Sister Unicorn Sitting On Rain…
Sister 7th Birthday Crazy Socks card
Sister Birthday Flowers Heart Pink card
Sister 8th Birthday Crazy Socks card
Birthday Heart of Flowers for a Sweet Sister on he…
Happy 23rd Birthday or a Stunning Sister, Purple A…
Sister 11th Birthday Crazy Socks card
Birthday - Sister - Blue Gingham/Flowers card
Happy 43rd Birthday Sister with Typewriter, Chicka…
20th Happy Birthday Sister, Magnolia Blossom card
Best Sister Ever 102nd Birthday Typography in Pink…
1st Birthday Big Sister Unicorn Sitting On Rainbow…
19th Happy Birthday Sister, Magnolia Blossom card
20th Birthday for a Special Sister, Magnolia Bloss…
Happy 18th Birthday or a Stunning Sister, Purple A…
Birthday Heart of Flowers for a Sweet Sister on he…
Happy 47th Birthday Sister with Typewriter, Chicka…
BIRTHDAY - Sister - Potato Family Collection card
Best Sister Ever 107th Birthday Typography in Pink…
Black Sister From Sister Birthday My Most Favorite…
6th Birthday Big Sister Unicorn Sitting On Rainbow…
7th Birthday Big Sister Unicorn Sitting On Rainbow…
Happy Birthday SISTER (yellow petals) card
Happy 29th Birthday to a Special Sister, Orange fl…
Happy 52nd Birthday Sister with Typewriter, Chicka…
Happy 39th Birthday to a Wonderful Little Sister, …
9th Birthday Big Sister Unicorn Sitting On Rainbow…
Happy 53rd Birthday Sister with Typewriter, Chicka…
10th Birthday Big Sister Unicorn Sitting On Rainbo…
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