马纳提县（英语：Manatee County, Florida，部分地区亦称为马那提郡）是位于美国佛罗里达州中部的一个郡县，靠近墨西哥湾。面积2,312平方公里。根据美国2000年人口普查统计，共有人口264,002人。县治布雷登顿（Bradenton）。

成立于1836年1月9日。县名的意思是海牛。

Manatee County is a county in the U.S. state of Florida. As of the 2010 census, the population was 322,833. Its county seat and largest city is Bradenton. The county was created in 1855. It was named for the Florida manatee (commonly called a "sea cow" and distantly related to the elephant), which is endangered and Florida's official marine mammal.