Oliver is a census-designated place (CDP) in Fayette County, Pennsylvania, United States.

US-119 and the Mon–Fayette lead southwest 29 miles (47 km) to Morgantown, West Virginia.

According to the United States Census Bureau, the CDP has a total area of 2.2 square miles (5.7 km2), all land.

[4] The climate in this area features relatively small differences between high and low temperatures, and there is adequate rainfall year-round.

32.2% of all households were made up of individuals, and 17.4% had someone living alone who was 65 years of age or older.