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- Malcolm McDowell (b. 1943), British two-time Golden Globe nominated actor
- Hugh Alexander McDowell (1953-2018), English cellist best known for his work with Electric Light Orchestra (ELO)
- Michael McEachern McDowell (1950-1999), American two-time Hugo Award nominated novelist and screenwriter
- Irvin McDowell (1818-1885), American Major General, best known for his defeat in the First Battle of Bull Run
- Brigadier-General Rex McKinley McDowell (1893-1984), American Assistant Director Office of the Surgeon General US Army (1939-1945)
- William Fraser McDowell (1858-1937), Bishop of the Methodist Episcopal Church
- Robert Brendan McDowell (b. 1913), Irish historian, Fellow Emeritus and former Professor of History at Trinity College, Dublin
- Paul L. McDowell (1905-1962), American Olympic bronze medalist rower at the 1928 Summer Olympics
- Graeme McDowell (b. 1979), Irish professional PGA golfer, winner of the Masters Tournament (2012), the U.S. Open (2010), The Open Championship (2012) PGA Championship (2009) and many more
- Charles T. McDowell (1921-2007), American academic and military officer
