Harry Dunlap MacGinitie (29 March 1896 – 31 January 1987) was an American paleobotanist.
His brother George Eber MacGinitie went on to study marine biology.
He studied briefly at Stanford University and then taught at a high school before joining Humboldt State College, Arcata in 1928, working there until 1960.
[1] MacGinitie was a specialist on fossil plants and worked on the Eocene flora of the Central Sierra Nevada, Miocene flora of the Columbia plateau, Eocene Chalk Bluffs, and the Florissant Beds.
He collaborated with Estella Leopold and helped in the establishment of the Florissant Fossil Beds National Monument.