J
- Jack Howell (baseball) (born 1961), American baseball player
- Jack Howell (footballer) (1924–1994), Australian rules football player
- Jack Howell (swimmer) (1899-unknown), American swimmer
- Jack P. Howell (1895-unknown), Australian rules football player
- James Howell (c. 1594–1666), British writer
- James B. Howell (1816–1880), American politician
- Jamie Howell (born 1977), English footballer
- Janet Howell (born 1944), American Democratic politician
- Jay Howell (born 1955), American baseball player
- Jennifer Howell, Canadian-American voice actor
- Jeremiah B. Howell (1771–1822), U.S. Senator from Rhode Island
- Jim Lee Howell (1914–1995), American football player
- Joe Howell, American songwriter
- John Howell (American football) (born 1978), American football player
- John Howell (American football halfback) (1915-unknown), American football player
- John Howell (politician) (born 1955), British Conservative politician
- John Adams Howell (1840–1918), American naval officer
- John Cummings Howell (1819–1892), American naval officer
- John H. Howell, American officer
- John McDade Howell (born 1922), American professor
- John Thomas Howell (1903–1994), American botanist
- John White Howell (1857–1937), American electrical engineer
- Joseph Howell (1857–1918), American Republican politician
- Joshua B. Howell (1806–1864), American officer
- J. P. Howell (born 1983), American baseball player
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