彭巴草原（西班牙语：Región pampeana，“彭巴”在当地克丘亚语中是“平原”的意思，中文又译作：“潘帕斯草原”）是南美洲一片大平原，包括阿根廷的布宜诺斯艾利斯省、拉潘帕省、圣非省、科尔多瓦省以及巴西南部的南里约格朗德州和乌拉圭全境，总面积约75万平方千米，中间只有布兰卡港附近的不足1300米的万塔纳山和不足500米的坦第尔山两座山峰，其余全是一望无际的平原。草原北接格连查科草原，南邻巴塔哥尼亚高原，西抵安第斯山麓，东至大西洋沿岸，这种地理格局导致来自太平洋的暖湿气流无法进入本区，故而形成草原地貌，南美第二大大河拉普拉塔河流过本区。

The Pampas (from Quechua pampa, meaning "plain") are fertile South American lowlands, covering more than 750,000 km (289,577 sq mi), that include the Argentine provinces of Buenos Aires, La Pampa, Santa Fe, Entre Ríos and Córdoba; most of Uruguay; and the southernmost Brazilian State, Rio Grande do Sul. These vast plains are a natural region only interrupted by the low Ventana and Tandil hills near Bahía Blanca and Tandil (Argentina), with a height of 1,300 m (4,265 ft) and 500 m (1,640 ft), respectively.