William Roach may refer to:
William N. Roach (1840–1902), United States Senator from North Dakota William Henry Roach (1784–1861), merchant and politician in Nova Scotia Bill Roach (footballer) (1925–2016), Australian rules footballer William Roach (cricketer) (1914–1944), Australian cricketer
See also William Roache (born 1932), English television actor William James Roache (born 1985), his son and fellow actor