21st Birthday Cards

Personalised 21st Birthday Cards

Turning 21 is a huge milestone – it’s the moment someone steps into full-blown adulthood, but still with plenty of fun ahead. At Moonpig, we’ve been helping people celebrate special birthdays for over 25 years, and our range of 21st Birthday Cards is perfect for marking this big day. Whether you're after heartfelt messages or hilarious designs, we've got a greeting card to match every personality.

Explore our personalised birthday cards for something unique – add your photos, thoughtful messages, or even inside jokes. Want to get the party started with a smile? Check out our funny birthday cards for a laugh-out-loud moment they'll remember. At Moonpig, we know greeting cards make moments memorable, and a 21st birthday deserves nothing less.

Order online at Moonpig or through our handy app – we’ll sort the rest (check out our delivery info page for details). Need a little inspiration? No worries, our huge selection of greeting cards makes finding the perfect birthday card simple, fun, and stress-free.

Ready to make someone’s 21st birthday one they'll never forget? Let's find the perfect card together.