Rimersburg (/ˈraɪmɛrzbərɡ/ RYE-merz-berg) is a borough in Clarion County in the U.S. state of Pennsylvania.

Pennsylvania Route 861 leads east from Rimersburg 12 miles (19 km) to New Bethlehem.

According to the United States Census Bureau, Rimersburg has a total area of 0.36 square miles (0.94 km2), all land.

There were 472 housing units at an average density of 1,329.8 per square mile (513.4/km2).

32.4% of all households were made up of individuals, and 18.8% had someone living alone who was 65 years of age or older.