The 2012–13 Illinois Piasa season was the seventh season of the Illinois Piasa indoor soccer club and third as a franchise in the Professional Arena Soccer League. The Piasa, named for the Piasa Bird of Native American legend, are an Eastern Division team who played their home games in The Sports Academy in Glen Carbon, Illinois. The team was led by owner Jim Williams and head coach Jason Norsic.

The team struggled in the regular season, compiling a 4–12 record. They placed fourth in the five-team Eastern Division and failed to advance to the postseason. The team fared better at home than on the road with all four of their wins coming on home turf. Two of the Piasa's four wins came against the Ohio Vortex but Illinois also provided Ohio with its only win of the season.

The Piasa participated in the 2012–13 United States Open Cup for Arena Soccer. They received a bye in the Wild Card round then lost to the Chicago Mustangs in the Round of 16, ending their tournament run.

For the 2012–13 season, the team named former goalkeeper Jason Norsic as head coach. He replaced both Joe Reiniger and Justin McMillian who had previously shared coaching duties. Norsic played college soccer at Southwestern Illinois College and McKendree University before playing professionally for the St. Louis Steamers, Swanner United FC, St. Louis Illusion, Piasa FC, and Illinois Piasa.

The team's official sportswear for the 2012–13 season was supplied by Admiral Sportswear, the world's oldest soccer brand.

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