James "Sunny Jim" Rolph Jr. (August 23, 1869 – June 2, 1934) was an American politician and a member of the Republican Party. He was elected to a single term as the 27th governor of California from January 6, 1931, until his death on June 2, 1934, at the height of the Great Depression. Previously, Rolph had been the 30th mayor of San Francisco from January 8, 1912, until his resignation to become governor. Rolph remains the longest-serving mayor in San Francisco history.