Jonathan Prentiss Dolliver (February 6, 1858 – October 15, 1910) was a Republican orator, U.S. Representative, then U.S.

After studying law, Dolliver was admitted to the bar in 1878, and commenced practice in Fort Dodge, Iowa.

"[1] In 1888, Dolliver challenged the incumbent congressman for Iowa's 10th congressional district, Adoniram J. Holmes, for the Republican nomination.

Dolliver was considered by some as a favorite to win the spot at the 1900 Republican National Convention.

[4] However, New York Governor Theodore Roosevelt, renowned for his victory in the Battle of San Juan Hill in the Spanish–American War, soon emerged as the leading candidate for that position.

In the 1908 presidential election, Dolliver's name was again touted as a potential vice-presidential candidate, this time on the ticket with William Howard Taft.

During Dolliver's service in the Senate, Iowa Republicans were divided between a conservative old guard that had dominated state politics since the Civil War, and a new progressive wing led by Albert B. Cummins, a lawyer and (after 1902) Governor of Iowa.

[7] However, he supported Allison,[10] who ultimately prevailed in the primary but died shortly thereafter, and was succeeded by Cummins.