John or Jack Hubbard may refer to:
Public officials John Hubbard (Maine politician) (1794–1869), American physician, educator and Democratic legislator John F. Hubbard (1795–1876), New York politician John F. Hubbard Jr. (1822–?), New York politician John Henry Hubbard (1804–1872), American legislator John Hubbard, 1st Baron Addington (1805–1889), English financier John Hubbard (admiral) (1849–1932), American naval officer John Hubbard, 3rd Baron Addington (1883–1966), English legislator and administrator
Scholars John R. Hubbard (1918–2011), American educator, historian and diplomat John Hubbard (physicist) (1931–1980), English physicist John H. Hubbard (born 1945), American mathematician and educator
Sportspeople Jack Hubbard (American football) (1886–1978), American college football player Johnny Hubbard (1930–2018), South African footballer Jack Hubbard (rugby union), English international rugby union player Jack Hubbard (rugby league), Australian rugby league player
Others John Hubbard (convict) (1839–after 1888), British clerk convicted of forgery and deported to Western Australia in 1865 John Hubbard (actor) (1914–1988), American actor John Hubbard (artist) (1931–2017), American painter
See also Hubbard (surname) Jon Hubbard, American politician