Keenleyside or Keenlyside is a surname that may refer to: Eric Keenleyside, (b. 1957), Canadian actor George Keenlyside (1889–1967), English footballer Hugh Llewellyn Keenleyside, CC (1898–1992), Canadian professor, diplomat and civil servant for whom the Keenleyside Dam is named Huong Keenleyside, (née Nguyen), (b. 1971), Vietnamese writer Sir Simon Keenlyside, (b. 1959), British opera singer Zenaida, Lady Keenlyside, ballet dancer, married to Sir Simon Keenlyside Tom Keenlyside, (b. 1950), Canadian musician