| Sankt Ilgen | |
| Settlement Type: | Former municipality |
| Pushpin Map: | Austria |
| Pushpin Mapsize: | 270 |
| Pushpin Map Caption: | Location within Austria |
| Coordinates: | 47.5447°N 15.1664°W |
| Subdivision Type: | Country |
| Subdivision Name: | Austria |
| Subdivision Type1: | State |
| Subdivision Name1: | Styria |
| Subdivision Type2: | District |
| Subdivision Name2: | Bruck-Mürzzuschlag |
| Parts Style: | para |
| Area Total Km2: | 73.44 |
| Elevation M: | 736 |
| Population Total: | 275 |
| Population As Of: | 1 January 2016 |
| Population Footnotes: | [1] |
| Population Density Km2: | auto |
| Timezone: | CET |
| Timezone Dst: | CEST |
| Utc Offset: | +1 |
| Utc Offset Dst: | +2 |
| Registration Plate: | BM |
| Postal Code Type: | Postal code |
| Postal Code: | 8621 |
| Area Code Type: | Area code |
| Area Code: | 03861 |
| Website: | www.st-ilgen.at |
Sankt Ilgen was a municipality in the district of Bruck-Mürzzuschlag in Styria, Austria.
As of 1 January 2015 it has been incorporated into Thörl.