Joshua Gaskill Newbold (May 12, 1830 – June 10, 1903) was the tenth Governor of Iowa.

Newbold served in the Iowa House of Representatives from 1872 to 1876.

He was elected Lieutenant Governor as a Republican in 1876, and succeeded to the governorship when Samuel J. Kirkwood resigned to take a seat in the United States Senate.

From 1899 to 1903, Newbold was mayor of Mount Pleasant, Iowa, where he died and was buried in the Forest Home cemetery in 1903.

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