Kelly Run is a 2.83 mi (4.55 km) long 1st order tributary to Sewickley Creek in Westmoreland County, Pennsylvania.

Kelly Run rises about 0.5 miles south of Herminie, Pennsylvania,[2] and then flows southwest to join Sewickley Creek at Hutchinson.

[3] Kelly Run drains 1.88 square miles (4.9 km2) of area, receives about an average of 1,016.30 millimetres (40.012 in) of precipitation each year, has a wetness index of 373.55, and is about 26% forested.

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