Henry Graham Ashmead (June 30, 1838 – November 27, 1920) was an American historian, journalist, and chronicler of Delaware County, Pennsylvania.

His parents were John Wayne Ashmead, a successful lawyer who served as the United States Attorney for the Eastern District of Pennsylvania, and Henrietta Graham Flower.

His maternal great-grandfather and namesake, Henry Hale Graham, was the first presiding judge of the Delaware County Courts of Common Pleas.

As a boy, he met Edgar Allan Poe, and as a young man, he was a friend of Frank R. Stockton, who named a character in his Christmas story "Major Pendallas" after Ashmead.

He practiced law briefly alongside classmate Leon Abbett, a future governor of New Jersey, but abandoned his legal career because of ill health, on the advice of his physicians.