The 2015 Marshall Thundering Herd football team represented Marshall University in the 2015 NCAA Division I FBS football season as members of the East Division of Conference USA.

They were led by sixth-year head coach John "Doc" Holliday and played their home games at Joan C. Edwards Stadium in Huntington, West Virginia.

The 2015 schedule consisted of six home and away games in the regular season.

The Thundering Herd hosted CUSA foes Florida International (FIU), North Texas, Old Dominion, and Southern Miss, and travelled to Charlotte, Florida Atlantic, Middle Tennessee, and Western Kentucky (WKU).

Marshall was invited to the St. Petersburg Bowl against the University of Connecticut which they won with a final score of 16–10.