圣奥斯特尔（St Austell，康沃尔语：S. Austel）是英格兰的一个城镇，也是康沃尔地区的主要城镇之一。据2011年人口普查，圣奥斯特尔有人口19,958人。

St Austell (/sᵻnt ˈɔːstəl/; Cornish:S. Austel) is a civil parish and major town in Cornwall, England, UK. It is situated on the south coast, approximately 10 miles (16 km) south of Bodmin and 30 miles (48 km) west of the border with Devon.

St Austell is one of the largest towns in Cornwall; in the 2011 Census, St Austell civil parish had a population of 19,958, with a total of 34,700 living in the wider area comprising several other civil parishes.