Other people's money (OPM) may refer to:

• Adam Smith's phrase in The Wealth of Nations (1776) Book V, ch 1, §107, that corporate directors will always be inefficient, because they preside over other people's money
  • The principal–agent problem in economics; the modern formulation of Smith's observation
• Other People's Money and How the Bankers Use It, 1914 book by Louis Brandeis
• Other People's Money, 1916 American silent film with Gladys Hulette and Kathryn Adams (actress, born 1893)
• Other People's Money (play), 1987 American stage drama by Jerry Sterner
• Other People's Money, 1991 American drama/comedy film based on Sterner play, starring Danny DeVito and Gregory Peck
• Other People's Money (novel), 2011 British novel by Justin Cartwright
• O.P.M. Leasing Services, a defunct computer leasing company