Valentin is a masculine given name. It comes from the Latin name Valentinus. Valentín is a Spanish form of Valentinus. Valentin or Valentín may refer to:
- The Nazi Germany code name for the Valentin submarine pens
- Valentín, a 2002 Argentine film
- José Valentín (born 1969), Puerto Rican baseball player
- Javier Valentín (born 1975), Puerto Rican baseball player
- Valentin Friedland (born 1490), German scholar
- Valentin Gjokaj (born 1993), Swiss association football player
- Valentin (grape), another name for the Austrian wine grape Roter Veltliner
- Vermentino, another wine grape with Valentin as a synonym