Doissin () is a commune in the department of Isère in southeastern France.
The main villages are: Bouis, Eynoud, Le Lutheau, Le Rousset, Trièves and Marquisière.
The nearest airport is GNB - Grenoble Saint Geoirs, located 16.7 km southwest of Doissin. The larger international airport LYS - Lyon Saint Exupery is 35.8 km northwest.