John Edward Marr FGS FRS (14 June 1857 – 1 October 1933) was a British geologist. After studying at Lancaster Royal Grammar School he matriculated to St John's College, Cambridge, graduating with First Class Honours in 1878. Following undergraduate work in the Lake District he travelled to Bohemia to investigate the fossil collection of Joachim Barrande, where his work won him the Sedgwick Prize in 1882.