Herman Sidney "Eagle" Day (October 2, 1932 – February 22, 2008) was an American punter in the National Football League (NFL) for the Washington Redskins and quarterback in the Canadian Football League (CFL) with the Winnipeg Blue Bombers, Calgary Stampeders and the Toronto Argonauts.

Day led Ole Miss to a 26–5–1 record in three seasons while playing for coach Johnny Vaught.

After a late-game 25-yard scramble during the 1956 Cotton Bowl Classic game against Texas Christian University, he was given the nickname "The Mississippi Gambler".

As a pitcher, Day was with the Rebels baseball team in 1956 when it went to the College World Series.

In 1961, Day left the NFL for the CFL, joining the Calgary Stampeders, with which team he remained through the 1965 season.