(Korean: 나길모 굴리엘모; RR: Nagilmo Guglielmo; December 7, 1926 – February 3, 2020) was an American-born Catholic missionary and bishop.

He entered the novitiate for the Catholic Foreign Mission Society of America, or Maryknoll, and professed religious vows on August 30, 1949.

[2] Pope John XXIII named McNaughton the Titular Bishop of Thuburbo Minus and Vicar Apostolic of Incheon on June 6, 1961.

William McNaughton was consecrated a bishop on August 24, 1961, by Cardinal Richard Cushing of Boston in St. Mary's Church, Lawrence, Massachusetts.

He was instrumental in establishing institutions and associations that ministered to the youth, workers, the poor, infants, and training lay leaders.

[1] His funeral was celebrated in St. Theresa's Church (Our Lady of Good Counsel Parish), Methuen, and he was buried in St. Patrick Cemetery, Lowell, Massachusetts.