Harley Harris Bartlett (March 9, 1886 – February 21, 1960) was an American botanist, biochemist, and anthropologist.

He was brought on as an undergraduate assistant at the Gray Herbarium, working under Merritt Lyndon Fernald and Benjamin Lincoln Robinson.

Inspired by botanist Hugo de Vries, he began publishing on the genetics of the genus Oenothera.

[1] After an invitation from Frederick Charles Newcombe, Bartlett joined the faculty of the University of Michigan in 1915.

In 1941, Bartlett successfully transported 4,800 Hevea brasiliensis plants to Haiti, helping establish the Société Haitiano-Américaine de Développement Agricole.

In 1955, the Department of Botany established the Harley Harris Bartlett Plant Exploration Fund as a way to finance botanical field trips.