- UEFA Union of European Football Associations. Organizing body for soccer/football in Europe. Most notably hosts UEFA Champions League, Europa League, Euros, and Euro Nations League
- UltraHardcore and organized group of supporters.
- UltrazHardcore supporters of a football club.
- UndercutA tackle that approaches from below, often dangerous.
- UnderdogA team or player expected to lose.
- UnplayableA ball or pitch condition that makes normal play impossible.
- UpendTo knock or tip someone over.
- USSFUnited States Soccer Federation. It is the official governing body of soccer in the United States and is a full member of FIFA.
- Utility PlayerA player who can play in multiple positions.
