Nykopings BIS is a Swedish football club located in Nykoping. The club started out as a merger in 1966 between Nykopings SK and Nykopings AIK. Since their foundation Nykopings BIS has participated mainly in the middle divisions of the Swedish football league system in particular Divisions 2 and 3.
During the period 1971 until 1980 and again in 1984 Nykopings BIS played in Division 2 which at that time was the second tier of Swedish football. The club currently plays in the third tier, Division 1. They play their home matches at the Rosvalla IP in Nykoping. Besides football Nykopings BIS is also a track and field club.
The club is affiliated to the Sodermanlands Fotbollforbund.