2015 Southern Utah Thunderbirds football team

The 2015 Southern Utah Thunderbirds football team represented Southern Utah University in the 2015 NCAA Division I FCS football season. They were led by eighth-year head coach Ed Lamb and played their home games at Eccles Coliseum. This was their fourth year as a member of the Big Sky Conference. They finished the season 8–4, 7–1 in Big Sky play to be crowned Big Sky champion for the first time. They received the Big Sky's automatic bid to the FCS playoffs where they lost in the first round to Sam Houston State.

On December 26, Lamb resigned to become the special teams coordinator and tight ends coach at BYU. He finished at Southern Utah with an eight year record of 45–47.