Slip Run is a tributary of West Branch Fishing Creek in Sullivan County, Pennsylvania, in the United States.

[1] Slip Run joins West Branch Fishing Creek 10.26 miles (16.51 km) upstream of its mouth.

[4] The geology in the vicinity of Slip Run has been affected by glaciation and the Wisconsinan Terminus crosses its watershed.

Further upstream, the surficial geology features bedrock consisting of sandstone and shale, with Boulder Colluvium occurring on a nearby upland.

[5] Wild trout naturally reproduce in Slip Run from its headwaters downstream to its mouth.