Marco Grassi
- Full name: Marco Grassi
- Nationality: Switzerland
- Date of birth: 19 January 1968
- Position: Striker (forward)
- Notable clubs: FC Basel, Neuchâtel Xamax, Servette FC, FC Sion, AS Monaco, FC Lugano, Stade Rennais FC (Rennes), FC Zürich
- Rennes (Stade Rennais FC): Marco Grassi played for Rennes during the 1996–1997 season in Ligue 1. He joined following spells in Swiss and French clubs and contributed as a forward during his time at the club.
- International career: Grassi was capped by the Switzerland national team; he represented Switzerland during the 1990s and was part of the squad at Euro 1996.
- Playing style: Known as a traditional centre-forward, Grassi combined physical presence with an eye for goal and was used primarily as a target man in attack.
- After playing career: Following retirement, Grassi has been involved in football in various capacities, including coaching and scouting roles (activities varied over the years).
Summary: Marco Grassi is a Swiss former striker who had a lengthy professional career across Switzerland and France, including a season at Stade Rennais (Rennes) in 1996–97, and represented Switzerland at international level, notably at UEFA Euro 1996.