Northern Campaign is a term used to describe attacks involving volunteers of the Irish Republican Army (IRA) during the Second World War between September 1942 and December 1944. It was a plan conceived by the then IRA Northern Command to launch attacks within Northern Ireland during this period. The plan, however, did not translate into tangible or co-ordinated action on the part of IRA units during the time frame. The title "Campaign" can largely be interpreted as having meaning only to the IRA Army Council of the period and later generations of IRA volunteers and Irish republicans wishing to canonise IRA activity of the period.

The Northern Campaign 1942–1944 should not be confused with the Border Campaign of the 1950s or the Provisional IRA campaign 1969-1997 which is also referred to as the "Northern Campaign" in some Republican circles and histories of the IRA / PIRA.