Welch Run is a 1.75 mi (2.82 km) long 1st order tributary to Buffalo Creek in Washington County, Pennsylvania.

Welch Run rises in a pond about 1.5 miles northeast of Dunsfort, Pennsylvania, in Washington County and then flows southwest to join Buffalo Creek at Dunsfort.

[3] Welch Run drains 0.89 square miles (2.3 km2) of area, receives about 40.1 in/year of precipitation, has a wetness index of 288.69, and is about 88% forested.

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