Metsä Board Oyj, previously known as M-real Corporation, is a Finnish producer of fresh fibre paperboards including folding boxboards, food service boards and white kraftliners.

Serlachius, and named Metsä-Serla (Forest Serla).

On 29 September 2008, M-Real sold four of its paper mills to South African company, Sappi.

Metsä Board has altogether seven production units in Finland (Kyro, Tako, Simpele, Äänekoski, Kemi, Joutseno, Kaskinen) and one in Sweden (Husum).

In autumn 2020, Metsä Board announced that it would open a competence center in Äänekoski focusing on cardboard and packaging.