Rocky Run is a tributary of Bull Creek in Butler County in the U.S. state of Pennsylvania.

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The entire course of Rocky Run is within Clinton Township. It rises just east of Sandy Hill Road along Glade Mill Road (part of PA Route 228). The stream generally flows in a southeastern direction towards Allegheny County. Rocky Run then empties into Bull Creek near Saxonburg Boulevard's intersection with Cherry Valley Road.

• List of rivers of Pennsylvania
• List of tributaries of the Allegheny River

• U.S. Geological Survey: PA stream gaging stations