奥拜恩县 (Obion County, Tennessee)是美国田纳西州西北部的一个县，北邻肯塔基州。面积1,438平方公里。根据美国2000年人口普查，共有人口32,450人。县治犹尼昂市 (Union City)。

成立于1823年10月24日。县名以奥拜恩河 (Obion River)命名。

Obion County is a county located in the U.S. state of Tennessee. As of the 2010 census, the population was 31,807. The county seat is Union City. The county was formed in 1823 and organized in 1824. It was named after the Obion River.

Obion County is part of the Union City, TN–KY Micropolitan Statistical Area, which is also included in the Martin-Union City, TN-KY Combined Statistical Area.