The Dayton Dragons are a Minor League Baseball team of the Midwest League and the High-A affiliate of the Cincinnati Reds. They are located in Dayton, Ohio, and play their home games at Day Air Ballpark. In 2011, they broke the record for most consecutive sellouts by a professional sports team, selling out their 815th consecutive game, breaking the record formerly held by the Portland Trail Blazers.

High-A, officially Class High-A, formerly known as Class A-Advanced, and sometimes abbreviated "A+" in writing, is the third-highest level of play in Minor League Baseball in the United States and Canada, below Triple-A and Double-A, and above Single-A. There are 30 teams classified at the High-A level, one for each team in Major League Baseball (MLB), organized into three leagues: the Midwest League, Northwest League, and South Atlantic League.