The 2011–12 Horizon League men's basketball season marks the 32nd season of Horizon League basketball.
In the preseason, Butler was the conference favorite despite returning only one of their top four scorers from the 2011 national runner-up team.
Butler received 28 first-place votes in the preseason poll of HL coaches, media, and sports information directors.
[1] The preseason player of the year was Ray McCallum, Jr. of Detroit who was also named to the John R. Wooden Award preseason candidate list.
[1] Preseason Player of the Year Several media outlets projected the final Horizon League standings for the 2011–12 season: HL Players of the Week Throughout the conference season, the HL offices name a player of the week.