Walter Irving McCoy (December 8, 1859 – July 17, 1933) was a United States representative from New Jersey and later was an Associate Justice and Chief Justice of the Supreme Court of the District of Columbia.

[2] McCoy was elected as a Democrat to the United States House of Representatives of the 62nd and 63rd United States Congresses and served from March 4, 1911, until October 3, 1914, when he resigned to accept a federal judgeship.

[1] He was confirmed by the United States Senate on October 2, 1914, and received his commission the same day.

[1] His service terminated on May 22, 1918, due to his elevation to be Chief Justice of the same court.

[1] McCoy resided in Washington, D.C., until 1932,[2] when he moved to Cambridge, Massachusetts,[2] where he died on July 17, 1933.