Thomas G. Hailey (July 13, 1865 – March 6, 1908) was an American attorney and judge in Oregon.

[1] In 1903, the Governor of Oregon appointed him to a committee to help devise new laws concerning water rights in the state.

[4] On December 5, 1905, Hailey was appointed by Oregon Governor George Earle Chamberlain to the Oregon Supreme Court to replace Charles E. Wolverton who had resigned to take a federal court position.

[5][6][7] Hailey did not win election to a full six-year term and left the court on January 15, 1907.

[6] After leaving the court, Hailey moved to Portland, Oregon, where he died, after a long illness, on March 6, 1908.