This depends on the season you are referring to.
If you are referring to the 1940-1941 season it was:Heracles
If you are referring to the 1941-1942 season it was: ADO Den Haag
The team that won the Dutch league in 1941 was Heracles.
This usually depends on the season you are referring to. However, ADO Den Haag took the Dutch league both years. If you are referring to the 1941-1942 season it was:ADO Den Haag If you are referring to the 1942-1943 season it was: ADO Den Haag
Feyenoord
Heracles
Twente
RCH
Feyenoord
Ajax
Ajax
Ajax
Feyenoord
Ajax