The playoffs were played from February 12 to March 27, 2012, with SC Langenthal defeating Lausanee HC to become Swiss Champions of NLB.
[2] Langenthal would later play HC Ambrì-Piotta in the league qualification series.
Since Ambrì-Piotta would defeat Langenthal in the series, there was no changes to the NLA or NLB teams for the 2012–2013 seasons.
The National League B regular season consists of 45 games, 2 double rounds playing each team twice, and a single round playing each team once.
SC Langenthal took on HC Ambrì-Piotta in a 7-game series, losing 4-1 and remaining in the National League B.