Klæbu is a village and municipality in Sør-Trøndelag county, Norway. It is located in the southern part of the Trondheim Region, about 20 kilometres (12 mi) south of the city of Trondheim. The administrative center is the village of Klæbu. The other major village in Klæbu is Tanem.
The village of Klæbu is located along the Nidelva river. The 1.74-square-kilometre (430-acre) village has a population (2009) of 3,063. The population density is 1,760 inhabitants per square kilometre (4,600 /sq mi).Even though agriculture has traditionally been the main industry for Klæbu, the municipality now functions more as a bedroom community of Trondheim, where many of Klæbu's inhabitants work or attend school.The municipality of Klæbu was established on 1 January 1838 (see formannskapsdistrikt). On 1 January 1899, the small northwestern part of Klæbu (population: 533) was separated from Klæbu to form the new municipality of Tiller.