John Cranke (/kræŋk/; 1746–1816) was an English scientific thinker and clergyman.
Cranke was admitted as a sizar at the age of 21 into Trinity College, Cambridge on 1 July 1767, after graduating from Sedbergh School.
His father was James Cranke, a notable artist who has an entry in Redgrave's Century of English Painters.
At the University of Cambridge, John Cranke obtained a BA in 1771, an MA in 1774, and a BD (Bachelor of Divinity) in 1792.
At Trinity he acted as a tutor in mathematics and is notable as the mentor of Thomas Jones.