The Thirtieth 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 regular session at the Oklahoma State Capitol in Oklahoma City from January 5 to July 22, 1965, during the first term of Governor Henry Bellmon. It was the last time the state legislature met only once every two years, and the first time since A. C. Hamlin left office in 1910 that the legislature included black members.