Mount Jewett is a borough in McKean County, Pennsylvania, United States. The population was 849 at the 2020 census. The students of the borough attend school in the Kane Area School District, even though the borough is surrounded by Hamlin Township—belonging to neighboring Smethport Area School District. Mount Jewett is near to the Kinzua Bridge State Park, which includes the Kinzua Bridge Sky Walk and Kinzua Viaduct. The current mayor is Brianna Howard.

McKean County is a rural county in the Commonwealth of Pennsylvania. As of the 2020 census, the population was 40,432. Its county seat is Smethport. The county was created in 1804 and organized in 1826. It was named in honor of former Pennsylvania Governor and Declaration of Independence signer Thomas McKean. The county is part of the North Central Pennsylvania region of the state.