| Image Coa: | DEU Theisseil COA.svg |
| Coordinates: | 49.7°N 26°W |
| Image Plan: | Theisseil in NEW.svg |
| State: | Bayern |
| Region: | Oberpfalz |
| District: | Neustadt a.d.Waldnaab |
| Verwaltungsgemeinschaft: | Neustadt an der Waldnaab |
| Elevation: | 557 |
| Area: | 21.40 |
| Postal Code: | 92637 |
| Area Code: | 09602 0961 |
| Licence: | NEW |
| Gemeindeschlüssel: | 09 3 74 160 |
| Mayor: | Johannes Kett[1] |
| Leader Term: | 2022 - 28 |
| Party: | CSU |
Theisseil is a municipality in the district of Neustadt an der Waldnaab in Bavaria, Germany.