The Fifty-fifth Oklahoma Legislature was the 2015 meeting of the legislative branch of the government of Oklahoma, which began with an organizational day on January 6, 2015. The first session met in February 2015 in the Oklahoma State Capitol in Oklahoma City during the first year of the second administration of Governor Mary Fallin. After the 2014 elections, the Republican Party held more than two-thirds of the seats in the Oklahoma Senate and the Oklahoma House of Representatives.