William Kingsland Macy (born November 21, 1889) was a Republican member of the United States House of Representatives from New York. Representing New York’s 1st Congressional District, he served two terms in Congress from January 3, 1947, to January 3, 1951. During this period, he held office as a federal legislator in the post–World War II era, when the nation was transitioning from wartime to peacetime conditions and confronting new domestic and international challenges.

Macy’s tenure in the House marked him as a historical member of Congress from New York. Serving as a Representative for two consecutive terms, he was part of the Republican Party’s delegation in the lower chamber of the federal legislature. After leaving office in 1951, he held the status of a former member of Congress. Further details about his committee assignments, legislative initiatives, or later life are not provided in the available record.