Eight-ball is a pool game played with a numbered solids-and-stripes ball set.

Eight-ball, 8-ball, or variants may also refer to:

• Eight-ball pool (British variation), also known as "eightball pool" or "blackball" depending on governing body, a primarily British and Commonwealth-countries game played with an unnumbered reds-and-yellows ball set
• 8 ball, the black ball, marked 8, used in pool games like eight-ball and blackball
• Magic 8 Ball, a toy that resembles the pool ball and provides advice, predictions, or answers to yes/no questions

• 8 Ball Aitken (born 1981), Australian musician
• 8Ball & MJG, an American hip hop duo
• 8 Ball, an EP by the Burden Brothers, 2002
• Eight Ball, an EP by Joi Cardwell, 1998
• "8 Ball", a song by Underworld
• "8-Ball", a song by Pop Smoke from the album Faith, 2021
• "Eight Ball", a song by N.W.A. from N.W.A. and the Posse
• Eightball Records, an American record label

• "8-ball", slang for one-eighth ounce (3.5 g) of a powdered psychoactive drug (typically cocaine, but also heroin, ketamine, or methamphetamine)
• 8-Ball, slang for Olde English 800 brand malt liquor

• 8-Ball (comics), a Marvel Comics supervillain and his successors
• Eightball (comics), a Daniel Clowes comic book
• Eight Ball (film), a 1992 Australian film
• 8-pallo, a 2013 Finnish film also known by its English-language name 8-ball
• 8-ball, a variety of zucchini
• 8-ball, an eight-dimensional n-ball in mathematics
• 8-Ball, a ring name used by Ronald Harris of the Harris Brothers
• The nickname of NASA Astronaut Group 21
• Eight-Ball, a 1977 pinball machine by Bally and the second best-selling pinball machine of all time.

• Eight Ball Deluxe, a Bally pinball machine
• Behind the eight ball (disambiguation)