The 2018 Lamar Cardinals football team represented Lamar University in the 2018 NCAA Division I FCS football season. The Cardinals were led by second-year head coach Mike Schultz and played their home games at Provost Umphrey Stadium. They played as a member of the Southland Conference. They finished the season 7–5, 6–3 in Southland play to finish in third place. They received an at-large berth to the FCS Playoffs, where they lost in the first round to Northern Iowa.