The Eastern Illinois Panthers are the intercollegiate athletic programs of Eastern Illinois University (EIU) located in Charleston, Illinois, United States. The Panthers athletic program is a member of the Ohio Valley Conference (OVC) and competes at the NCAA Division I level in the Football Championship Subdivision. EIU's colors are blue and gray. Selected as the team mascot in 1930, EIU's panther, was informally known as "Billy" for many years and was officially named "Billy the Panther" in 2008. Panther teams have won five NCAA national championships in three sports. The Panthers also won the 1969 NAIA men's soccer title.
O'Brien Field is a 10,000-seat multi-purpose stadium in Charleston, Illinois. It is home to the Eastern Illinois University Panthers football and track and field teams. O’Brien Field is name after Maynard O'Brien who coached football and track at Eastern Illinois University. The stadium features a nine-lane track and in 2004 an artificial turf field was installed. In 2009 a state of the art scoreboard was installed on the north end of the field with a video board and new sound system.
The stadium served as the summer home for the former St. Louis Cardinals football team in 1976 and 1977 and again from 1982–87.
The record attendance for O'Brien Field was 12,600 on November 9, 1980 vs. Northern Iowa. The all-time Win-Loss-Tie record at O'Brien Field is 178-95-3 as of the end of the 2019 football season.
The stadium also plays host to the IHSA State Finals in track and field every year.