Robert Duncan Filmography
| 2019 | Radius · as Dane |
| 2017 | Devil's Night · as Gerry |
| 2014 | Hotel Secrets & Legends (TV Series) · as Al Swearengen (2014) |
| 2013 | Diabolical (2013) (TV Series) · as David Messenger |
| 2010 | Unusual Suspects (TV Series) · as Officer Billy Fields |
| 1999 | Third Watch (TV Series) · as John Bynum |
| 1998 | The New Addams Family (TV Series) · as Vincent Vice |
| 1998 | First Wave (TV Series) · as Mabus |
| 1998 | Voyage of Terror · as Mutineer |
| 1997 | Stargate SG-1 (TV Series) · as Seth |
| 1997 | Dead Man's Gun (TV Series) · as Dalton Coe |
| 1994 | Viper (TV Series) · as Peter Holtz |