John Tatham (fl. 1632–1664) was an English dramatist of the mid-17th century. He was a strong Cavalier.
Little is known of Tatham personally. He was a Cavalier, with a hatred of the Puritans and of the Scots – he went so far as to invent a dialect that he claimed was the Scots vernacular.
Fancy's Theatre, a collection of his poems, was published in 1640. It included an elegy on the dramatist John Day. In the years 1657–64, Tatham produced eight pageants for the annual London Lord Mayor's Show, seven of which were entitled London's Triumph). He also wrote London's Glory, an entertainment to celebrate the return of King Charles II to London at the Restoration. This was performed on 5 July 1660.
Among the known plays by John Tatham are:
In 1682, Aphra Behn adapted The Rump as a play of her own, The Roundheads.