Pengxi County (Chinese: 蓬溪县; pinyin: Péngxī Xiàn) is a county of Sichuan Province, China, bordering Chongqing to the southeast. It is under the administration of Suining city.

Pengxi County comprises 1 subdistrict, 17 towns and 2 townships:

30°45′43″N 105°42′18″E / 30.76194°N 105.70500°E / 30.76194; 105.70500