•
John A. Spencer (inventor) - ubiquitous bimetal snap-action temperature sensor •
John Spenser or Spencer (1559–1614), one of the translators of the authorized version (1611) of the Bible and president of Corpus Christi College, Oxford •
John Spencer (priest) (1630–1693), English clergyman and scholar, Master of Corpus Christi College, Cambridge • Pseudonym of
William Edward Vickers (1889–1965), English mystery writer •
John Spencer (actor) (1946–2005), American actor in television series' including
L.A. Law and
The West Wing •
John Spencer (boat designer) (1931–1996), New Zealand architect and boat designer •
John H. Spencer (1907–2005), historian and advisor to Ethiopia •
John O. Spencer (1857–1947), fifth president of Morgan College • Henk van Broekhoven, later known as John Spencer, Dutch singer, see
The Dynamic Rockers •
John Spencer (businessman) (1934 or 1935–2016), New Zealand business magnate •
John Spencer (military officer), American military officer, researcher and author •
John Walton Spencer (1843–1912), American nature educator ==See also==