Jack Llewellyn Knight (May 29, 1917 – February 2, 1945) was an American National Guard officer who was killed in action during World War II.

He was awarded the United States highest military decoration for valor, the Medal of Honor, posthumously.

First Lieutenant Knight's official Medal of Honor citation reads: He led his cavalry troop against heavy concentrations of enemy mortar, artillery, and small arms fire.

After taking the troop's objective and while making preparations for a defense, he discovered a nest of Japanese pillboxes and foxholes to the right front.

1st Lt. Knight's gallantry and intrepidity were responsible for the successful elimination of most of the Japanese positions and served as an inspiration to officers and men of his troop.He was awarded the Texas Legislative Medal of Honor in May 1999.