Bad Hair Day is a 1996 album by "Weird Al" Yankovic.

Bad Hair Day may also refer to:

• "Bad Hare Day" (Brandy & Mr. Whiskers), a television episode of Brandy & Mr. Whiskers
• "Bad Hair Day" (Courage the Cowardly Dog), a television episode of Courage the Cowardly Dog
• "Bad Hair Day" (Modern Family), a television episode of Modern Family
• "Bad Hair Day" (Sailor Moon), a television episode of Sailor Moon
• Bad Hair Day (2015 film), a Disney television movie
• Bad Hair Day (2024 film), a Spanish comedy film
• "Bad Hair Day", an episode of season 3 of Phineas and Ferb
• "Bad Hair Day", an episode of Donkey Kong Country

• Agave 'Bad Hair Day', a variety of Mangave

• Bad Hair (disambiguation)
• Bad Hare Day, a Goosebumps book