Dwight Whitney Morrow (January 11, 1873 – October 5, 1931) was an American businessman, diplomat, and politician of Scots-Irish descent, best known as the U.S. ambassador who improved U.S.-Mexican relations, mediating the religious conflict in Mexico known as the Cristero rebellion (1926–29), but also contributing to an easing of conflict between the two countries over oil. The Morrow Mission to Mexico was an "important step in the 'retreat from imperialism'".