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The Treaty of Arras of 17 May 1579 was a peace treaty concluded between the Spanish Crown, represented by Alexander Farnese, Duke of Parma, and representatives of the County of Hainaut, the County of Artois, and the cities of Douai, Lille, Orchies and Arras, all members of the Union of Arras, that had been formed on the 6 January 1579.
It was a separate peace that formally ended the state of war that had existed between these entities during the Eighty Years' War. The provinces and towns that had formed the Union of Utrecht (23 January 1579) continued the war.