The Arms Crisis was a political scandal in the Republic of Ireland in 1970 in which Charles Haughey and Neil Blaney were dismissed as cabinet ministers for alleged involvement in a conspiracy to smuggle arms to the Irish Republican Army in Northern Ireland. At the ensuing Arms Trial, charges against Blaney were dropped, and Haughey and the other alleged conspirators were found not guilty. Blaney claimed that the then government knew about the plan, while Haughey denied any involvement.
The events occurred during the Fianna Fáil government of Jack Lynch. Amid the 1969 Northern Ireland riots, which would lead to the Troubles, nationalist families were being forced from their homes, and refugees "streamed over the border" into the Republic. The Dublin government established a cabinet subcommittee to organise emergency assistance and relief. Haughey, then Minister for Finance and the hardline Blaney, Minister for Agriculture and Fisheries who was from the Donegal North-East constituency bordering Northern Ireland were members of the subcommittee, along with Pádraig Faulkner and Joseph Brennan. Jack Lynch took little interest in the work of the subcommittee, and after an initial meeting, Faulkner and Brennan seem to have left their senior colleagues Haughey and Blaney to their own devices. A government fund of £100,000 was set up to provide relief to civilians forced out of their homes by the Troubles, and Haughey was given sole authority over this money.