Thornton John Kipper (September 27, 1928 – March 29, 2006) was an American pitcher in Major League Baseball who played from 1953 through 1955 for the Philadelphia Phillies.

A standout pitcher in college, Kipper spent one year (1946) at the University of Wisconsin–Madison before joining the U.S. Navy during peacetime.

Together with catcher Bob Wilson, Kipper formed one of the Big Ten Conference's top batteries.

In a three-season career, he went 3–4 with 35 strikeouts and a 5.27 ERA in 55 appearances, including three starts, one save, and 99.0 innings of work.

Following his majors career, Kipper pitched in the Kansas City Athletics minor league system.