The 2017–18 Louisiana Ragin' Cajuns men's basketball team represented the University of Louisiana at Lafayette during the 2017–18 NCAA Division I men's basketball season. The Ragin' Cajuns were led by eighth-year head coach Bob Marlin and played their home games at the Cajundome as members in the Sun Belt Conference. They finished the season 27–7, 16–2 in Sun Belt play to win the Sun Belt regular season championship. The conference championship was the school's first since first regular-season title since sharing the 2000 title and its first outright title since joining the conference in 1991. They defeated Texas State in the quarterfinals of the Sun Belt tournament before losing in the semifinals to Texas–Arlington. As a regular season conference champion who failed to win their conferenc