朱尼亚塔县（Juniata County, Pennsylvania）是美国宾夕法尼亚州中南部的一个县。面积2,358平方公里。根据美国2000年人口普查，共有人口381,751。县治密夫林。

成立于1749年8月19日，县名来自朱尼亚塔河（印第安语的意思是 People of the standing stone「顽石部落」）。

Juniata County is a county located in the U.S. state of Pennsylvania. At the 2010 census, the population was 24,636. Its county seat is Mifflintown. The county was created on March 2, 1831, from part of Mifflin County and named for the Juniata River.