Michelle Duncan (born 14 April 1978) is a Scottish-Canadian actress. Duncan trained in acting at Queen Margaret University, Edinburgh before studying English and Classics at The University of St Andrews.

Her television roles include: Baptiste, Hanna, Grantchester, Sugar Rush, Doctor Who, Low Winter Sun, Lost in Austen, and a TV film, Whatever Love Means, as Princess Diana opposite Olivia Poulet as Camilla Parker Bowles and Laurence Fox as Prince Charles.

Film work includes: Bohemian Rhapsody, Elizabeth is Missing, Atonement, The Broken, and as Rupert Grint's love interest in Driving Lessons with Julie Walters. Duncan's role in Atonement was particularly praised by The New Yorker theatre critic Anthony Lane. Duncan's stage work includes: Time and the Conways (Bath Theatre Royal/ touring), A Midsummer Night's Dream and The Burning at the Edinburgh Festival Fringe.

Further television work includes: New Tricks and Call the Midwife. Duncan lent her voice to an adaptation of The Little Mermaid by Hans Christian Andersen at Little Angel Puppet Theatre in 2006 alongside Dame Judy Dench, Sir Michael Gambon, Rory Kinnear, Claudie Blakley, Rosamund Pike, Claire Rushbrook and Peter Wight.

In 2007 she was cast as Portia in The Merchant of Venice at Shakespeare's Globe, but was unable to continue after the previews and was replaced by Kirsty Besterman. In 2012 Duncan appeared alongside Amanda Hale in Scrubber, a film written and directed by Romola Garai.

In 2015 she starred alongside Ruth Negga, Douglas Henshall and Tom Brooke in Scott Graham's Film "Iona". The closing gala film of the Edinburgh Film Festival. She took the role of Bea (originally performed by Helen Baxendale) in Deborah Bruce's play The Distance, directed by Charlotte Gwinner, for Sheffield and the Orange Tree Theatres.

She stars opposite Jamie Robson in the award winning Blue Christmas (2016) directed by Cannes Critics' Week (2022) favourite Charlotte Wells.