Turčianske Jaseno is a village and municipality in Martin District in the Žilina Region of northern Slovakia.
The name is derived from Slovak jaseň (ash tree). Jaseno means "place overgrown with ash trees".
In historical records the settlement was first mentioned in 1274 as Jezen, Jescen. The original settlement developed into two villages. Horné Jaseno and Dolné Jaseno merged to Turčianske Jaseno in 1973.
The municipality lies at an altitude of 500 metres and covers an area of 20.465 km². It has a population of about 350 people.