John or Jack Willis may refer to:
Arts and entertainment John A. Willis (1916–2010), American entertainment historian Jack Willis (filmmaker) (1934–2022), American journalist, writer and filmmaker John Willis (musician), American guitarist and songwriter John Willis (television executive), British television executive, historian and author
Law and politics John Walpole Willis (1793–1877), Welsh-born judge in New South Wales John Willis (New York politician) (fl. 1846) John H. Willis (politician) (fl. 1910s), American politician in Arizona John Willis (judge) (1908–1988), British judge John T. Willis (politician), American politician in Maryland
Religion John Willis (bishop) (1872–1954), English Anglican bishop John Willis (priest) (fl. 1930s–1940s), Irish Anglican priest John T. Willis (biblical scholar) (1933–2023), American Old Testament scholar
Sports John Willis (cricketer) (1886–1963), English cricketer John Willis (basketball) (born 1952), American-Israeli basketball player Jack Willis (rugby union) (born 1996), English rugby union player
Others John Willis (inventor) (c. 1575–1625), British developer of shorthand stenography John Christopher Willis (1868–1958), English botanist John Harlan Willis (1921–1945), U.S. Navy hospital corpsman John Willis (RAF officer) (1937–2008), English Royal Air Force officer John Willis (gangster) (born 1971), American mobster linked with the Chinese Mafia
Other uses Jock Willis Shipping Line, historic London shipping business USS John Willis, Dealey-class destroyer escort in the United States Navy
See also Jonathan S. Willis (1830–1903), American minister, farmer and politician Jon Willis (born 1981), British fencer John Willis Clark (1833–1910), English academic and antiquarian John Willis Fleming (1781–1844), English landed proprietor and member of parliament John Willis Menard (1838–1893), American federal government employee, poet, newspaper publisher and politician