John Hanna Robb (4 November 1873 – 21 June 1956) was a Northern Irish barrister and Ulster Unionist Party politician. The son of Rev. J. Gardner Robb, DD, LLD and Martha, daughter of Rev. John Hanna, of Ballymagowan House. Robb was born in Clogher and was educated at Royal Belfast Academical Institution, Queen's College, Belfast and called to the Bar at Gray's Inn and King's Inns, Dublin in 1898. Robb lived at Deramore Park, North Belfast, with his wife Emily and their daughter.