The 1918 Arizona gubernatorial election took place on November 5, 1918 for the post of the Governor of Arizona. Thomas Campbell, who served a partial term in 1917 and had his election overturned by the Supreme Court of Arizona, returned to contest the Governors office. Incumbent Governor Hunt declined to run again after the stress of the close elections and the year-long court battle. Despite falling to its lowest percentage in years, the sole third party challenger held the difference between the two candidates. The Democratic challenger was state senator Fred T. Colter, a pro-Hunt Democrat.