The 40-year-old Steijn, a former Den Haag player, had been in charge since mid-2011, taking them to 15th place in 2012 and ninth last season.
He was the fourth managerial casualty of this Dutch league season after changes at NEC Nijmegen, AZ Alkmaar and Roda JC Kerkrade.
Den Haag have picked up just seven points from their last 10 league matches.
Henk Fraser will step up from assistant to caretaker coach for the rest of the season, starting with Friday's match at Vitesse Arnhem.
(Reporting by Mark Gleeson; Editing by Ed Osmond) nL3N0LA2YF
