The Madrid peace conference letter of invitation, also known as the Madrid Invitation or Letter of invitation to the Middle East Peace Conference in Madrid, of October 19, 1991, was a formal diplomatic invitation by the United States and the Soviet Union issued to Israel, Syria, Lebanon, Jordan and the Palestinians, calling on them to come together and hold a peace conference in Madrid, Spain. The resulting conference came to be known as the Madrid Conference that commenced on October 30, 1991.