| Glen D. Riley Observatory | |
| Organization: | Naperville Astronomical Association |
| Location: | Naperville, Illinois, US |
| Coords: | 41.7007°N -88.1588°W |
| Altitude: | 197 meters (647 feet) |
| Telescope1 Name: | "Abrahamian/Carhart" Telescope |
| Telescope1 Type: | 16 inch reflector |
Glen D. Riley Observatory is an astronomical observatory owned and operated by Naperville Astronomical Association. It was founded 1973 and located in Naperville, Illinois (US). Partnered with the DuPage Valley Observatory, which is equipped with a custom 12.5" astrograph for video imaging; together, they make up the association's "Astronomy Education Center". The facility is used both by the organization's members and for extensive public outreach.