The Peoria Chiefs are a minor league affiliate of the Chicago Cubs, compete in the Midwest League and play their home games O'Brien Field in Peoria, Illinois.
Professional baseball in Peoria can be traced back to 1878, with the formation of an independent team named the Peoria Reds. In mid September 2004 the Chiefs announced an affiliation switch back to the Chicago Cubs. This change was accompanied with a new logo in November and new jerseys for the 2005 season.