Constance Nevlin Johnson is an American politician from the U.S. state of Oklahoma. She served in the Oklahoma Senate, representing District 48, which encompasses portions of northeastern and northwestern Oklahoma County until 2014. She was first elected to the state senate in a special election in September 2005.

The 2014 United States Senate special election in Oklahoma took place on November 4, 2014, to elect a member of the United States Senate to represent the State of Oklahoma, concurrently with the regularly-scheduled election to Oklahoma's other Senate seat, as well as other elections to the United States Senate in other states and elections to the United States House of Representatives and various state and local elections.