The Windy City ThunderBolts (colloquially known as the Bolts) are a professional baseball team based in Crestwood, Illinois.

The Bolts are one of the three Frontier League teams located in the Chicago metropolitan area, along with the Joliet Slammers and Schaumburg Boomers.

The ThunderBolts are currently one of the oldest teams in the Frontier League, along with the Evansville Otters, Gateway Grizzlies and Washington Wild Things.

The franchise known as the Windy City ThunderBolts started as the Will County Claws in 1995 and played their home games at Lewis University's Brennan Field in Romeoville.

In Midlothian, the Cheetahs would have one of their best seasons finishing in second place with a 37–29 record in the first half and earn a playoff spot for the first time in franchise history.

In the Heartland League championship, the Cheetahs swept the heavily favored Tennessee Tomahawks 2 games to 0 to gain the franchise's first title.

After heavy rains flooded Homer Stryker Field, the entire 2008 championship series was played at the Thunderbolts' Standard Bank Stadium.

The ThunderBolts currently play at Ozinga Field (which was renamed from Standard Bank Stadium in 2018) which is located in Crestwood, Illinois.

On October 27, 2023, Former White Sox Closer and 2005 World Series Champion, Bobby Jenks, was named Field Manager.

In 2011, Dylan Axelrod became the first former ThunderBolt and second player in franchise history to play in MLB, having been called up by the Chicago White Sox.

Pitcher Andrew Werner became the third player in club history to make it to the majors when he started for the San Diego Padres in 2012.

As of January 2023, the Cubs, Marlins, A's, Twins, Rays, Pirates, Blue Jays, Rangers, Padres and White Sox currently have former ThunderBolts' players or coaches in their organizations.