Walter Joseph Kowalczyk (born April 17, 1935) is a former American football defensive back and fullback in the National Football League for the Philadelphia Eagles and the Dallas Cowboys. He also played in the American Football League for the Oakland Raiders. Kowalczyk played college football at Michigan State University and placed third in Heisman Trophy voting in 1957. He was drafted in the first round of the 1958 NFL Draft.
Kowalczyk is a member of The Pigskin Club of Washington, D.C. National Intercollegiate All-American Football Players Honor Roll.
He currently lives in the Rochester, Michigan area. He is active in community activities and volunteers his time teaching Drivers Training classes.