2018–19 Horizon League men's basketball season

The 2018–19 Horizon League men's basketball season began with practices in October 2018, followed by the start of the 2018–19 NCAA Division I men's basketball season in November. Conference play began in January 2019 and concluded in February 2019. The season marked the 39th season of Horizon League basketball.

Preseason poll
Source

 first place votes

Preseason All-Conference Teams
Source

Preseason Player of the Year: Drew McDonald, Northern Kentucky

Conference matrix
This table summarizes the head-to-head results between teams in conference play.

Coaching changes
On March 26, 2018, Detroit Mercy fired head coach Bacari Alexander after two seasons. On June 5, the school hired Texas Southern head coach Mike Davis as the Titans' new coach.