A firm is a commercial partnership of two or more people.

Firm or The Firm may also refer to:

• The Firm (1989 film), a British drama
• The Firm (1993 film), an American legal thriller based on John Grisham's novel
• The Firm (2009 film), a remake of the 1989 film
• The Firm (2012 TV series), a Canadian television series and a sequel to the 1993 film
• The Firm (Malaysian TV series), a TV series that began in 2007

• The Firm (album), album by rock group The Firm
• The Firm (soundtrack), an album by Dave Grusin
• The Firm (hip hop group), an American hip hop supergroup between 1996 and 1998
• The Firm (novelty band), a band best known for their hits "Star Trekkin'" and "Arthur Daley E's Alright"
• The Firm (rock band), a British rock band that was active from 1984 to 1986 with Paul Rodgers and Jimmy Page.

• The Firm (novel), a novel by John Grisham
• The Firm: The Inside Story of McKinsey, a book by Duff McDonald
• "The Firm", J. C. Williamson's, Australian show-business organization

• USS Firm (AM-444), an Aggressive-class minesweeper launched in 1953
• USS Firm (AM-98), an Adroit-class minesweeper laid down in 1941
• HMS Firm, eight Royal Navy ships

• The Firm, slang for the inner British royal family
• The FIRM, a brand of workout videos and fitness products
• The Firm, Inc., a talent management company
• Fair Immigration Reform Movement
• Flood insurance rate map
• British firms (organised crime)

• Hooligan firm, a violent football supporters' group
• Fishery Resources Monitoring System (FIRMS)
• All pages with titles containing Firm