海洋县（Ocean County, New Jersey）是美国新泽西州东部的一个县，东临大西洋。面积2,372平方公里。根据美国2000年人口普查，共有人口510,916。县治汤姆斯河 (Toms River)。

成立于1850年2月15日。县名来自大西洋。

Ocean County is a county located along the Jersey Shore in the U.S. state of New Jersey. Its county seat is Toms River, which, like the county itself, has been one of the fastest growing areas of the state since the 1990s. Ocean County had a Census-estimated population of 588,721 in 2015, a 2.1% increase from the 576,567 enumerated in the 2010 United States Census, having increased by 65,651 (+12.8%) from the 2000 Census population of 510,916, surpassing Union County to become the fifth-most populous county in the state and making Ocean County the fastest growing in the state of New Jersey in terms of increase in the number of residents and second-highest in percentage growth. Ocean County was established on February 15, 1850, from portions of Monmouth County, with the addition of Little Egg Harbor Township which was annexed from Burlington County on March 30, 1891. The most populous place was Lakewood Township, with 92,843 residents at the time of the 2010 Census (up 32,491 since 2000, the largest population increase of any municipality in the state), while Jackson Township, covered 100.62 square miles (260.6 km), the largest total area of any municipality in the county.