The Ninth Oklahoma Legislature was a meeting of the legislative branch of the government of Oklahoma, composed of the Oklahoma Senate and the Oklahoma House of Representatives. The state legislature met in Oklahoma City, in regular session from January 2 to March 31, 1923,^[1] during the short term of Governor Jack C. Walton, and in two special sessions after his impeachment.

Tom Anglin served as President pro tempore of the Oklahoma Senate and Murray Gibbons served as Speaker of the Oklahoma House of Representatives.

• Regular session: January 2-March 31, 1923
• First special session: October 11, 1923 – January 14, 1924
• Second special session: January 15, 1924 – March 15, 1924

Previous: 8th Legislature • Next: 10th Legislature

• The state legislature successfully impeached Governor Jack C. Walton, who was suspended on October 23, 1923, and convicted and removed from office of November 19, 1923. Lieutenant Governor Martin Trapp became acting governor upon his suspension and the sixth Governor of Oklahoma upon his conviction.^[2]
• Soon after taking office, Trapp called the Oklahoma Legislature into special session to investigate state officials and agencies.^[3]

Lieutenant Governor Martin Trapp served as President of the Senate until the suspension of the governor on October 23, 1923, and his conviction on November 19, 1923.^[2] Tom Anglin served as President pro tempore of the Oklahoma Senate.^[4] Murray Gibbons was Speaker of the Oklahoma House of Representatives.^[1]