Jack Randolph Thornell (born August 29, 1939) is an American photographer. He won a Pulitzer Prize for his photo of James Meredith after the activist was attacked and wounded by a sniper during his June 1966 March Against Fear in Mississippi.
Thornell was born in Vicksburg, Mississippi. He served in the Army Signal Corps. He worked as a photographer for the Jackson Daily News (1960–1964), and for decades for the Associated Press.