| Gilbert Run | |
| Name Other: | Tributary to Marilla Brook |
| Pushpin Map: | Pennsylvania#USA |
| Pushpin Map Caption: | Location of Gilbert Run mouth |
| Subdivision Type1: | Country |
| Subdivision Name1: | United States |
| Subdivision Type2: | State |
| Subdivision Name2: | Pennsylvania |
| Subdivision Type3: | County |
| Subdivision Name3: | McKean |
| Length: | 3.43miles[1] |
| Discharge1 Location: | Marilla Brook |
| Discharge1 Avg: | 10.76cuft/s at mouth with Marilla Brook[2] |
| Source1: | Quaker Run divide |
| Source1 Location: | about 5 miles northwest of Bradford, Pennsylvania |
| Source1 Coordinates: | 41.9975°N -78.7419°W[3] |
| Source1 Elevation: | 2270feet |
| Mouth: | Marilla Brook |
| Mouth Location: | about 3 miles west of Bradford, Pennsylvania |
| Mouth Coordinates: | 41.954°N -78.7164°W |
| Mouth Elevation: | 1618feet |
| Progression: | Marilla Brook → West Branch Tunungwant Creek → Tunungwant Creek → Allegheny River → Ohio River → Mississippi River → Gulf of Mexico |
| River System: | Allegheny River |
| Tributaries Left: | unnamed tributaries |
| Tributaries Right: | unnamed tributaries |
| Waterbodies: | Bradford City Number 2 Reservoir |
| Bridges: | none |
Gilbert Run is a 3.43miles long second-order tributary to Marilla Brook.[1]
Gilbert Run rises about northwest of Bradford, Pennsylvania, and then flows south-southeast to meet Marilla Brook about 3 miles west of Bradford, Pennsylvania.
Gilbert Run drains of area, receives about of precipitation, and is about 87.51% forested.[2]