James Isaac Dolliver (August 31, 1894 – December 10, 1978) served six terms as a Republican U.S. Representative from Iowa's 6th congressional district, beginning in 1944. He was the nephew of U.S. Senator Jonathan Prentiss Dolliver of Iowa.
Born in Park Ridge, Illinois, to Rev. and Mrs. Robert H. Dolliver, he received elementary education in Illinois schools at Lanark, Pawpaw, Eochelle, Lockport and Joliet before moving to Hot Springs, South Dakota. He graduated from Morningside College, Sioux City, Iowa, in 1915. He taught school at Alta, Iowa, and Humboldt, Iowa, until 1918, when he enlisted in the U.S. Army and was enrolled in signal officers' training school at New Haven, where he was when the First World War ended.
Following the conclusion of his military service, he attended the University of Chicago Law School where he became a member of the Delta Chi Fraternity, graduating in 1921. He was admitted to the bar the same year and commenced private practice in Chicago.
Dolliver moved to Fort Dodge, Iowa, in 1922. He served as the County Attorney for Webster County, Iowa from 1924 to 1929, then returned to private practice. He served as member of the school board of Fort Dodge School District between 1938 and 1945. He also served a term as commander of the Iowa American Legion.
In 1942, Dolliver ran against Governor George A. Wilson and two others for the Republican nomination for U.S. Senate. In the primary election, Dolliver finished a distant third.