Henry Augustus Purdie (December 16, 1840 – March 29, 1911) was an American ornithologist and naturalist.
He was a founding member of the American Ornithologists' Union, and a president of the Nuttall Ornithological Club.
He was the son of John Purdie, a British consul, and Eleanor Pratt, his Massachusetts-born wife.
Although born in the Ottoman Empire, he moved to West Newton, Massachusetts as a child.
He also provided notes for books written by such figures as Edward Augustus Samuels and Elliott Coues .