Byåsen is a large neighborhood area in the city of Trondheim in Trøndelag county, Norway. It constitutes a large part of the city in the borough of Midtbyen. It encompasses a number of areas southwest of the main city centre. This includes all areas on the west side of the river Nidelva and north of Granåsen. This is mainly a residential area, with 32,136 residents as of January 1, 2003. Gråkallbanen tram line connects Byåsen to the city centre along with a number of bus routes (8, 5, and 19) as well as night time services by bus and tram in the weekends.