William Adam Swiacki (October 2, 1922 – July 7, 1976) was an American football end in the National Football League. He played five seasons for the New York Giants (1948–1950) and the Detroit Lions (1951–1952). He played college football at Columbia University and was drafted in the sixteenth round of the 1946 NFL Draft by the Boston Yanks. His son, Bill Swiacki, Jr., was a standout three-sport athlete at Amherst College who was drafted by both the NFL New York Giants and MLB Los Angeles Dodgers.