James M(a)cMillan may be:
- James McMillan (fur trader) (1783–1858), a fur trader, explorer and founder of Fort Langley, British Columbia
- James W. McMillan (1825–1903), a Union officer during the American Civil War
- James McMillan (Senator) (1838–1902), a Senator and politician from Michigan, USA
- James MacMillan (composer) (born 1959), a composer from Scotland
- James McMillan (cricketer) (born 1978), a New Zealand cricketer
- James McMillan (footballer), former Sunderland player
- James A McMillan, former Everton footballer
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