皮尔 （Pierre, South Dakota，IPA：pir）是美国南达科他州首府、休斯县县治。位于该州中部、密苏里河畔。根据2000年美国人口普查，人口为13,876 人，是美国人口第二小的州府。

Pierre (/ˈpɪər/ PEER) (Lakota: čhúŋkaške; "fort") is the capital of the state of South Dakota and the county seat of Hughes County. The population was 13,646 at the 2010 census, making it the second least populous state capital after Montpelier, Vermont. Founded in 1880 on the Missouri River opposite Fort Pierre, Pierre has been the capital since South Dakota gained statehood on November 2, 1889, having been chosen for its location in the geographic center of the state. Fort Pierre itself was named after Pierre Chouteau, Jr., an American fur trader of French origin.