Leige Clare Alternate name(s): Lege; LiegeClairDate of Birth: circa 1915Unit: Abraham Lincoln Battalion
James William Clarke Alternate name(s): ClarkDate of Birth: 4 Oct 1912Unit: Mackenzie Papineau Battalion
Ralph A. D. Cleveland Alternate name(s): Clevaland; Anton De Wolfe ClevelandDate of birth: 18 July, 1893Unit: Appears to have not reached Spain, likely refused in Paris because of his age
Randolph Phifer Cleven Alternate name(s): Philfer; Clevens; Clemens; RalfDate of birth: 14 April, 1917Unit: Trained with the 2 Battalion of Instruction, Tarazona; Mackenzie Papineau Battalion, Company 3; Served at Fuentes de Ebro through the Ebro Offensive
Joshua Ward Cluny Alternate name(s): Cluny; ClureyDate of birth: 2 May, 1905Unit: Mackenzie Papineau Battalion, Company 3, Section 2, first aid; Scout; Stretcher bearer; Communications
James Ernest Cochrane Date of birth: 7 April, 1904Unit: Mackenzie Papineau Battalion, Company 3, Section 2, group leader, later Company political commissar; Spanish Red Cross
Thomas Cochrane Date of birth: 12 October, 1885Unit: Abraham Lincoln Battalion; Censor: mail service; Served at Jarama and Brunete; Lost behind enemy lines at Brunete for three days