唐娜安娜县（英语：Doña Ana County）是美国新墨西哥州南部的一个县，东南邻德克萨斯州，南邻墨西哥，面积9,880平方公里。根据2010年人口普查，本县共有人口209,233人。本县县治和最大城市皆为拉斯克鲁塞斯（Las Cruces），而该城市亦是新墨西哥州第二大城市。

本县于1852年1月9日成立，是原始的九个县之一，县名来自同名的第一个县治，而该县治的名字则来自一位女慈善家唐娜安娜·罗夫莱多。

Doña Ana County is a county located in the southern part of the state of New Mexico, in the United States. As of the 2010 census, the population was 209,233, which makes it the second-most populated county in New Mexico. Its county seat is Las Cruces, the second-largest in New Mexico. Doña Ana is a Spanish name meaning "Madam Anna" and was probably given in honor of some Spanish matron.