Sir Thomas Robert Tighe Chapman, 7th Baronet (6 November 1846 – 8 April 1919), was an Anglo-Irish landowner, the last of the Chapman baronets of Killua Castle in County Westmeath, Ireland. For many years he lived under the name of Thomas Robert Lawrence, taking the name of his partner, Sarah Lawrence, the mother of his five sons, one of whom was T. E. Lawrence, 'Lawrence of Arabia'.