British linguist John Henderson Sinclair (1935–2009), British scholar and academic John Sinclair (environmentalist) (1939–2019), Australian environmentalist Jackie Sinclair (1943–2010), Scottish footballer John Sinclair (footballer) (born 1948), Australian rules footballer for Essendon John Sinclair (German fiction), fictional protagonist of a popular German "penny dreadful" John Sinclair (sociologist) (born 1944) See also Jonathan Sinclair (disambiguation) Jack Sinclair (disambiguation) Sinclair, John