The Halabja massacre, also known as the Halabja chemical attack, was a massacre of Kurdish people that took place on 16 March 1988, during the Iraqi–Kurdish conflict in the closing days of the Iran–Iraq War in Halabja, Kurdistan, Iraq. The attack was part of the Al-Anfal Campaign in Kurdistan, as well as part of the Iraqi Army's attempt to repel the Iranian Operation Zafar 7. It took place 48 hours after the capture of the town by the Iranian Army. A United Nations (UN) medical investigation concluded that mustard gas was used in the attack, along with unidentified nerve agents.

The Iraqi–Kurdish conflict consists of a series of wars, rebellions and disputes by the Kurds against the central authority of Iraq starting in the 20th century shortly after the defeat of the Ottoman Empire in World War I. Some put the marking point of the conflict beginning to the attempt by Mahmud Barzanji to establish an independent Kingdom of Kurdistan, while others relate to the conflict as only the post-1961 insurrection by the Barzanis. Since the US-led invasion of Iraq and the subsequent adoption of federalism and the recognition of the Kurdistan Region (KRI) as a federal entity in the new Iraqi constitution, the number and scope of armed clashes between the central government of Iraq and the Kurds have significantly decreased. In spite of that, however, there are still outstanding issues that continue to cause strife such as the disputed territories of northern Iraq and rights to export oil and gas, leading to occasional disputes and armed clashes. In September 2023, following a series of punitive measures by the central government in Iraq against KRI, Masrour Barzani sent a letter to the President of the United States expressing concerns about a possible collapse of the Kurdistan Region, and calling for the United States to intervene.