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A birthday is an annual celebration of the date on which a person was born.

Birthday may also refer to:

In music:

• "Birthday" (The Beatles song)
• "Birthday" (Flo Rida song)
• "Birthday" (Junior Boys song)
• "Birthday" (The Sugarcubes song)
• Birthday (The Crüxshadows EP), or the title song
• Birthday (Infected Mushroom EP)
• Birthday (The Association album)

In film and television:

• Birthday (1977 film), an Azerbaijani film
• "Birthday" (Angel episode)
• "Birthday" (Dynasty), an episode of Dynasty
• "The Birthday" (Joe 90 episode)
• "Birthday", an episode of The Care Bears

In other uses:

• Birthdays (retailer), a British greeting cards retailer
• The Birthday (anthology), a collection of Ring-series stories by Koji Suzuki
• The Birthday (painting), a painting by Marc Chagall
• Birthday Problem, A statistical model predicting the probability of n people in a room having the same birthday

See also

• B'Day, an album by Beyoncé
• Birthday party (disambiguation)
• Happy Birthday (disambiguation)

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