Trin is a municipality in the Imboden Region in the Swiss canton of the Grisons . Crestasee is located in Trin.

Trin is first mentioned in the 12th century as Turunnio.

Trin is perched on the mountain-side above the Rhine valley on the road between Domat/Ems and Flims . The village of Mulin (also in the municipality) is at the foot of the slope on the edge of the valley.

Trin has an area, as of 2006, of 47.2 km2 (18.2 sq mi).