John Howell is the name of:
John Howell (athlete) (born 1936), British Olympic long jumper
John Howell (defensive back) (born 1978), National Football League safety
John Howell (halfback) (1915–1946), National Football League halfback
John Howell (Atlanta) (1933–1988), community activist in Atlanta, Georgia
John Howell (MP for Exeter), 17th century, English MP for Exeter (UK Parliament constituency), 1601
John Howell (politician) (born 1955), British Member of Parliament
John Howell (polyartist) (1788–1863), Scottish polyartist in Edinburgh
John Howell (pioneer) (c.1810–1874), New Zealand whaler, trader, pastoralist, and politician
John Adams Howell (1840–1918), a rear admiral of the United States Navy, served in the American Civil War and the Spanish–American War; also a noted inventor.
John Cummings Howell (1819–1892), a rear admiral of the United States Navy, served in the American Civil War
John McDade Howell (1922–2016), American academic; chancellor of East Carolina University
John Howell (American civil rights activist) (1933-1988), American civil and human rights activist
comedian and lawyer, Sydney
John Howell & Son, 19th-century British engineering company