Other
- James Macdonald (engineer) (1862–1927), Scottish engineer, explorer and cartographer
- James A. Macdonald (1862–1923), newspaper editor, educator, minister and author in Ontario, Canada
- James MacDonald, 6th of Dunnyveg (died 1565), Scoto-Irish chieftain
- Sir James MacDonald, 9th of Dunnyveg (died 1626), last chief of Clan MacDonald of Dunnyveg or Clan Donald South
- James MacDonald (pastor) (born 1960), founder of Harvest Bible Chapel, Walk in the Word and Harvest Bible Fellowship
- James David Macdonald (ornithologist) (1908–2002), British and Australian ornithologist and ornithological writer
- James Ross MacDonald (born 1923), American physicist
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