The 2025 Marshall Thundering Herd football team represented Marshall University in the Sun Belt Conference's East Division during the 2025 NCAA Division I FBS football season. The Thundering Herd were led by Tony Gibson in his first year as the head coach. The Thundering Herd played home games at the Joan C. Edwards Stadium, located in Huntington, West Virginia.
The Marshall Thundering Herd drew an average home attendance of 25,298, the 83rd-highest of all NCAA Division I FBS football teams.
Following the departure of head coach Charles Huff to conference rival Southern Miss the day after the 2024 SBC championship game, 50 Thundering Herd players entered the transfer portal, with 21 of them eventually following Huff to Southern Miss. According to ESPN writer Bill Connelly, Marshall "is starting over [in 2025] like almost no one ever has"; between graduation and transfers:
In the Sun Belt preseason coaches' poll, the Thundering Herd were picked to finish sixth place in the East division.
Tight end Toby Payne was named to the preseason All-Sun Belt first team offense. Offensive lineman Jalen Slappy was named to the second team offense.