Henry Filmer (died 1543) was a 16th-century English Protestant martyr, one of the Windsor Martyrs, during the reign of Henry VIII.

Filmer was a Protestant tailor and church warden of St John the Baptist Church, Windsor, Berkshire who complained about the overly Catholic sermons of the vicar.^[1] He gained the support of the Bishop of Salisbury much to the consternation of a former Catholic mayor of the town, William Simonds.^[1] His powerful friend, Dr John London, who was Bishop Gardiner's agent, arrested Filmer, along with four others,^[1] and, on 4 August 1543, he, Robert Testwood and Anthony Pearson were burnt to death.^[2]