The Ambassador is an automobile manufactured and marketed by American Motors Corporation (AMC) from 1957 through 1974 over eight generations, available in two- and four-door sedan, two-door hardtop, four-door station wagon as well as two-door convertible body styles. It was classified as a full-size car from 1957 through 1961, mid-size from 1962 until 1966, and again full-size from 1967 through 1974 model years.

When discontinued, the Ambassador nameplate had been used from 1927 until 1974, the longest continuously-used car nameplate until then. The Ambassador nameplate was used variously as the Ambassador V-8 by Rambler, Rambler Ambassador, and finally AMC Ambassador. Previously, the nameplate Ambassador applied to Nash's full-size cars. The nameplate referred to a trim level between 1927 and 1931.

Ambassadors were continuously manufactured at AMC's Lake Front plant in Kenosha, Wisconsin until 1974, as well as at AMC's Brampton Assembly in Brampton, Ontario between 1963 and 1966. Australian Motor Industries (AMI) assembled Ambassadors from knock-down kits with right-hand drive from 1961 until 1963. The U.S. fifth-generation Ambassadors were manufactured by Industrias Kaiser Argentina (IKA) in Córdoba, Argentina from 1965 until 1972, as well as assembled by ECASA in Costa Rica from 1965 through 1970. Planta REO assembled first-generation Ambassadors in Mexico at its Monterrey, Nuevo León plant. Fifth- and seventh-generation Ambassadors were modified into custom stretch limousines in Argentina and the U.S.