Leslie Colby Cornish (October 8, 1854 – June 24, 1925) was a chief justice of the Maine Supreme Judicial Court.

After Colby, Cornish began a career in education, serving as both teacher and principal of Petersborough High School in New Hampshire.

He attended Harvard Law for only one year before returning to Maine, and was admitted to the Kennebec Bar in November 1880.

[1] On March 31, 1907, Cornish was appointed an associate justice of the Maine Supreme Judicial Court by Governor William T. Cobb.

In 1922, Cornish was selected to join United States Supreme Court Chief Justice of the United States William Howard Taft on a Committee for the American Bar Association to draft a code of judicial ethics.