阿卡德尔菲亚（Arkadelphia）位于美国阿肯色州中部，是克拉克县的县治。

根据2000年美国人口普查，共有10,912人，其中白人占68.98%、非裔美国人占26.51%、亚裔美国人占1.29%。

Arkadelphia is a city in Clark County, Arkansas, United States. As of the 2010 census, the population was 10,714. The city is the county seat of Clark County. It is situated at the foothills of the Ouachita Mountains. Two universities, Henderson State University and Ouachita Baptist University, are located there. Arkadelphia was incorporated in 1857.