Rattling Run is a tributary of Catawissa Creek in Schuylkill County, Pennsylvania, in the United States.

The stream is considered to be a High-Quality Coldwater Fishery and Class A Wild Trout Waters.

Rattling Run begins on the southern border of Brandonville in East Union Township.

It flows north and slightly west, reaching the central part of Brandonville after several tenths of a mile.

After crossing Pennsylvania Route 339, it turns west-northwest and reaches its confluence with Catawissa Creek after several tenths of a mile.

[1] Rattling Run joins Catawissa Creek 26.32 miles (42.36 km) upstream of its mouth.

[4] At 11:31 A.M. on June 19, 1997, the air temperature in the vicinity of Rattling Run 0.57 miles (0.92 km) upstream of its mouth was 22 °C (72 °F).

[1] Rattling Run flows over rock of the Mauch Chunk Formation for its entire length.

[3] Rattling Run is in the United States Geological Survey quadrangle of Shenandoah.

[3][4] Additionally, it is considered by the Pennsylvania Fish and Boat Commission to be Class A Wild Trout Waters.