John Barkham, D.D. (1572?–1642) was an English clergyman, antiquary and historian. Highly reputed in his time as an authority, he published relatively little. He supported the efforts of John Speed, and may have been a source for the Display of Heraldry of John Guillim (the book was attributed to him as a publication under Guillim's name, for some time). Barkham made a very extensive collection of coins, which he gave to William Laud; who presented them to the Bodleian library. He left also a treatise on coins in manuscript, which was never published.