Austin Jay Knickerbocker (October 15, 1918 – February 18, 1997) was an American professional baseball player whose 11-season career included 21 Major League games played for the Philadelphia Athletics during the 1947 season.

An outfielder, he threw and batted right-handed, stood 5 feet 11 inches (1.80 m) tall and weighed 185 pounds (84 kg).

Born in Bangall, a hamlet of Stanford, New York, Knickerbocker attended Duke University[1] and began his professional career at age 21 in 1940.

)[2] The performance earned Knickerbocker a promotion all the way to the top level of the minors, with the 1942 Jersey City Giants, but he played only 30 games that season, then spent 1943–1945 serving in the United States Army during World War II.

In his April 19, 1947, debut for the Athletics, he was a pinch runner against the Boston Red Sox, and mostly languished on the bench in the early weeks of the campaign, getting only five at bats before the May cutdown date, when he was optioned to the Triple-A Toronto Maple Leafs.