罗克兰县（Rockland County, New York）是美国纽约州东南部的一个县，东傍哈得逊河，西、南邻新泽西州。面积516平方公里。根据美国2000年人口普查，共有人口286,753，而在美国2010年人口普查，人口已增加到311,687人。县治新市（New City）。

成立于1798年2月23日，县名的意思是「多石的地方」。

Rockland County is the southernmost county on the west side of the Hudson River in the U.S. state of New York, part of the New York–Newark–Jersey City, NY–NJ–PA Metropolitan Statistical Area. The county's population, as of the 2010 census, was 311,687, increasing by 4.6% to a 2015 Census estimate of 326,037, making it the third most densely populated county outside of New York City within New York State (after Nassau and neighboring Westchester counties, respectively). The county seat is New City. Although Rockland County does not directly border any New York City boroughs, it lies only 9 miles northwest of the city at their closest points, and is accessible through 10 exits on the New York State Thruway. The name derives from "rocky land", as the area was described by early Dutch and English settlers.