Isachsen Stadion, until 2012 known as Nedre Eiker Stadion, and until 2015 as Mjøndalen Arena is a football stadium located at Mjøndalen in Nedre Eiker, Norway. It is the home ground of Mjøndalen IF in the Tippeligaen, providing a capacity for 4,350 spectators. The venue was completely renovated in 2011-12 and received artificial turf.