| Siegfried Theiß | |
| Nationality: | Austrian |
| Occupation: | Architect |
| Birth Date: | 17 November 1882 |
| Birth Place: | Bratislava, Austria-Hungary |
| Death Place: | Vienna, Austria |
Siegfried Theiß (17 November 1882 - 24 January 1963) was an Austrian architect. His work was part of the architecture event in the art competition at the 1948 Summer Olympics.[1]