John McClellan may refer to:
- John McClellan (chemist) (1810–1881), chemist and industrialist in Widnes, England
- John Little McClellan (1896–1977), politician from Arkansas, USA
- John J. McClellan (1874–1925), chief organist in the Salt Lake Tabernacle of The Church of Jesus Christ of Latter-day Saints, 1900–1925