The 2019 Big Sky Conference men's basketball tournament was the postseason tournament for the Big Sky Conference, held March 13–16 at CenturyLink Arena in Boise, Idaho.
Regular season and defending tournament champion Montana defeated Eastern Washington 68–62 in the championship game to gain the conference's automatic bid to the 68-team NCAA tournament.
It was Montana's eleventh Big Sky tournament title, which leads the conference; its first came in 1991.
The eleven teams were seeded by conference record, with a tiebreaker to seed teams with identical conference records.
The top five teams received a first round bye.