麦克肯恩县（McKean County, Pennsylvania）是美国宾夕法尼亚州北部的一个县，北邻纽约州。面积2,549平方公里。根据美国2000年人口普查，共有人口45,936。县治斯美司波特。

成立于1804年3月26日，县名纪念第二任州长汤马斯·麦克肯恩。

McKean County is a rural county located in the U.S. state of Pennsylvania. As of the 2010 census, the population was 43,450. Its county seat is Smethport. The county was created in 1804 and later organized in 1826. It was named in honor of former Pennsylvania Governor and Declaration of Independence signer Thomas McKean.