Donald Stewart or Don Stewart may refer to:

Arts and entertainment

• Donald Alexander Stewart (1876–1940), Scottish architect
• Donald Ogden Stewart (1894–1980), American author and screenwriter
• Donald Stewart (actor) (1910–1966), American actor
• Donald Franklin Stewart (1929–1996), American museum curator
• Donald E. Stewart (1930–1999), American screenwriter
• Donald Bruce Stewart (1935–2006), American actor
• Donald Stewart (Benidorm), character from TV show Benidorm

Law and politics

• Donald Stewart (Wisconsin politician) (1825–?), American politician in Wisconsin
• Donald Stewart (North Dakota politician) (born ca. 1832), Scottish-born American politician in North Dakota
• Donald Stewart (Scottish politician) (1920–1992), Scottish National Party politician
• Donald Morton Stewart (1923–1990), Canadian politician in the Northwest Territories
• Donald Stewart (judge) (1928–2016), Australian judge and Royal Commissioner
• H. Donald Stewart (born 1939), American politician in the New Jersey General Assembly
• Donald Stewart (Alabama politician) (born 1940), U.S. Senator from Alabama
• Don Stewart (Canadian politician) (born 1946), Canadian politician in Newfoundland

Sports

• Donald Stewart (tennis) (1859–1885), British tennis player
• Don Stewart (Australian footballer) (1913–1979), Australian rules footballer
• Don Stewart (rugby league) (born 1967), Western Samoan international rugby league footballer

Others

• Sir Donald Stewart, 1st Baronet (1824–1900), British field marshal
• Donald William Stewart (1860–1905), British military officer
• Don Stewart (Bonaire activist) (1925–2014), American environmental activist
• Don Stewart (preacher) (born 1939), American Pentecostal minister and faith healer
• Donald Scott Stewart, American mechanical engineer