Robert P. Linn (December 27, 1908 – August 22, 2004) was among the longest-serving mayors in the United States.
Linn, a Republican, served 58 years as the mayor of Beaver, Pennsylvania, a borough around 25 miles (40 km) northwest of Pittsburgh.
He worked for the Duquesne Light Company, and in 1945 was approached by a group of Republicans who wanted to defeat the incumbent mayor, a position then known as burgess.
Afterward he changed his mind, taking out a newspaper advertisement telling people to vote for his opponent.
In 1995, he was officially listed in Guinness Book of World Records as the longest-serving mayor in the United States; in a 2002 interview, he said his major accomplishment in office was starting Streetscape, a town beautification project that replaced concrete sidewalks with red bricks and removed power lines from the main street.