William Reagan Gorham (合波武 克人, Gōhamu Katsundo, 4 January 1888 – 24 October 1949) was an American-born Japanese automobile engineer who emigrated to Japan. Gorham would make substantial contributions to the technology and capability of Japan's fledgling automobile industry, and worked with a number of companies that would eventually be merged into the Nissan Motor Company by Yoshisuke Aikawa, who would become a close friend and business partner to Gorham.