Grenmar was a Norwegian newspaper, published in Porsgrunn in Telemark county.
Grenmar was started on 3 January 1878, after two trial issues in December 1877.
Grenmar, which was conservative, got a liberal competitor in Porsgrunds Dagblad in 1914.
In September it was revived and synchronized with two other conservative newspapers in the district, Fylkesavisen (until then known as Fremskridt) from Skien and Breviks Dagblad from Brevik.
Skien newspaper Varden bought the three in 1954,[1] and all in all lost most of its liberal colour, instead supporting the Conservatives.