John Cosgrove may refer to: John Cosgrove (Missouri politician) (1839–1925), U.S. Representative from Missouri John Cosgrove (Virginia politician) (born 1954), American politician and member of the Senate of Virginia John F. Cosgrove (1949–2006), Florida legislator John Cosgrove (actor) (1867–1925), Australian actor, writer and director John M. G. Cosgrove (born 1949), Garda Síochána and recipient of the Scott Medal