Olean is a city in Cattaraugus County, New York, United States. Olean is the largest city in Cattaraugus County and serves as its financial, business, transportation and entertainment center. It is one of the principal cities of the Southern Tier region of Upstate New York.
The city is surrounded by the town of Olean and is located in the southeastern part of Cattaraugus County. The population was 13,437 in 2019 per the United States Census Bureau.