The Twelfth 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 8 to March 30, 1929, and in one special session.^[1] State legislators successfully impeached Governor Henry S. Johnston during the legislative session.^[2]

• Regular session: January 8-March 30, 1929

Previous: 11th Legislature • Next: 13th Legislature

• When the state legislature met in regular session in 1929, members of the Oklahoma House of Representatives presented 13 charges against Governor Henry S. Johnston.^[2] On January 21, Johnston was suspended from office and Lieutenant Governor William J. Holloway became acting governor. Johnston’s impeachment trial began in February and ended in March with his impeachment on one charge.^[2] Holloway then succeeded Johnston to become the eighth governor of Oklahoma.
• Governor William J. Holloway called a special session on May 16, 1929. The state legislature adjourned on July 5, with the resolution of acquiring toll bridges along the border.^[3]

C.S. Storms served as President pro tempore of the Oklahoma Senate in 1929.^[4] James C. Nance served as Speaker of the Oklahoma House of Representatives.^[1]