Richard Joseph "Peg Leg" Lonergan (January 16, 1900 - December 26, 1925) was an American underworld figure and labor racketeer.
He was a high-ranking member and the final leader of the White Hand Gang.
He succeeded Bill Lovett after his murder in 1923 and, under his leadership, led a two-year campaign against Frankie Yale over the New York waterfront until he and five of his lieutenants were killed in South Brooklyn during a Christmas Day celebration at the Adonis Social Club in 1925.