John James Blaine (May 4, 1875 – April 16, 1934) was an American lawyer and progressive Republican politician from Grant County, Wisconsin.

[1] Blaine served as vice-president of a telephone company, and as mayor of Boscobel, Wisconsin, for three one-year terms: 1901–1902, 1903–1904, and 1906–1907.

He was on the Grant County Board of Supervisors, and was a member of Wisconsin State Senate (16th District) from 1909 to 1912.

[4] Blaine crossed party lines during the 1928 presidential campaign and endorsed Democratic nominee Al Smith for president.

Blaine resumed the practice of law at Boscobel and was appointed a director of the Reconstruction Finance Corporation by President Franklin Roosevelt, serving until his death.