Robert Duncan (born 27 July 1952 as Robert Welch) is an English actor.
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- 2010 - Witness for the Prosecution (Agatha Christie Theatre Company production) as Mayhew
- 2011 - Verdict (Agatha Christie Theatre Company production) as Karl Hendryk
- 2012 - Murder on the Nile/Hidden Horizon (Agatha Christie Theatre Company production) as Canon Pennyfather
- 2013 - Go Back for Murder (Agatha Christie Theatre Company production) as Phillip Blake
- 2022 - The Unexpected Guest (Windsor On Air)