| Neu-Thierstein Castle | |
| Native Name: | Schloss Thierstein |
| Built: | c. 1180/1190 |
| Type: | spur castle |
| Condition: | ruin |
| Location: | Büsserach |
| Coordinates: | 47.3849°N 7.5382°W |
| Map Type: | Canton of Solothurn#Switzerland |
| Code: | CH-SO |
Neu-Thierstein Castle is a ruined castle in the Swiss municipality of Büsserach in the canton of Solothurn, Switzerland.