James (or Jim or Jimmy) McMillan or MacMillan may refer to:
Sportspeople James McMillan (footballer, born c. 1866) (c. 1866–?), played for Sunderland James McMillan (footballer, born 1869) (1869–1937), played for Scotland, Everton and St Bernard's James McMillan (Scottish footballer), played for Notts County Jim McMillan (Canadian football) (born 1952), American football player Jim McMillan (speedway rider) (born 1945), Scottish motorcycle speedway rider James McMillan (cricketer) (born 1978), New Zealand cricketer
Musicians James MacMillan (born 1959), Scottish composer James McMillan (trumpeter), British jazz trumpeter, record producer and founder and owner of Quietmoney Recordings
Politicians James McMillan (politician) (1838–1902), U.S. Senator from Michigan James Bryan McMillan (1916–1995), U.S. federal judge Jimmy McMillan (born 1946), U.S. fringe politician, founder of Rent Is Too Damn High Party James E. McMillan (died 1907), mayor of Victoria, British Columbia Jim McMillan (Florida Sheriff) (born 1937), Jacksonville Sheriff
Other James McMillan (fur trader) (1783–1858), founder of Fort Langley, British Columbia James W. McMillan (1825–1903), Union officer during the American Civil War Lynching of Jim McMillan on June 18, 1919, in Alabama James Francis McMillan (1948–2010), Scottish historian and author J. W. McMillan (brick manufacturer) (1850–1925), Scottish brick manufacturer in the American South