Martial law is the imposition of military rule.

Martial law may also refer to:

• Martial Law (TV series), a late 1990s television series
• Martial Law (1991 film), the 1991 film starring David Carradine
• Martial Law 2: Undercover, 1991 film

Marshal or Marshall law may refer to:

• Marshal Law (comics)
• Marshal Law, the 1996 film starring Jimmy Smits
• Marshall Law (TV series), an Australian television series
• Marshall Law (Tekken), a character of the Tekken series