John Foster (1770–1843) was an English Baptist minister and essayist.
The son of a weaver, born in Halifax, Yorkshire, and educated for the ministry at the Baptist college in Bristol, Foster served as a minister for a number of years. Becoming a full-time writer, he contributed nearly 200 articles to the Eclectic Review. His works include Essays, in a Series of Letters (1804), and Essay on the Evils of Popular Ignorance (1820), in which he urged the necessity of a national system of education.