William "Bill" Mackrides (born July 8, 1925 in Philadelphia, Pennsylvania) is a former American football quarterback for the Philadelphia Eagles of the National Football League. He helped the Eagles win the 1948 & 1949 NFL Championships. Mackrides played college football for the University of Nevada, Reno and lead the nation in passing in 1947.
In his last season in 1953, Mackrides played for the Pittsburgh Steelers and was the last Steeler to wear uniform number 13 in a regular season game until punter Jeremy Kapinos wore that number in 2010.
Mackrides later gained degrees (MS and PhD) in Education and Psychology. He has since retired and now resides in Delaware County, Pennsylvania nearby to his four children, 12 grandchildren, and 1 great-granddaughter. He also founded a summer day camp in Chester Springs, PA., in 1959, which is currently family owned and operated.