Lieutenant-General William Augustus Johnson (15 October 1777, in Kenilworth – 26 October 1863, in Witham, Lincolnshire) was an English soldier and Member of Parliament. He was the eldest son of Church of England clergyman the Rev. Robert Augustus Johnson and Anna Rebecca (youngest sister of Lord Craven) and a descendant of Archdeacon Robert Johnson. He was educated at Rugby School. He married Lucy Foster (1815–1890) on 17 February 1835. He stood many times for Parliament, and served as Member of Parliament for Boston, 1821–1826 and for Oldham, 1837–1847.