Pehr Gustaf Holmes (April 9, 1881 – December 19, 1952) was a United States representative from Massachusetts.

Holmes was born in Mölnbacka in Forshaga Municipality in Värmland, Sweden. In 1886, when he was 4 years old, Holmes immigrated to the United States with his parents, who settled in Worcester, Massachusetts.

Holmes attended the Millbury Street School public school until he was 14.

When he turned 14 Holmes left school and went to work for the Reed and Prince Manufacturing Co. of Worcester where he "tended machines". Holmes also worked at the Brunell Electroplating plant, where he learned the business of Electroplating. In 1909 Holmes established his own Electroplating firm, the Holmes Electrotype Foundry.

Holmes also engaged in the banking and insurance business.

Holmes was elected member of the Worcester Common Council from Ward 6. In 1913 Holmes became a member of the Worcester Board of Aldermen, serving as its president.

Holmes was inaugurated mayor of Worcester on January 1, 1917, he served as mayor until January 5, 1920.

Holmes served as a member of the Massachusetts Executive Council, Seventh Councilor district from 1925 to 1928.