Below is a list of television series and mini-series that Michelle has starred in. They are listed in reverse-chronological order, with the most recent ones last. Click on the titles to read more about each project individually.
| 2005 | Fingersmith | as Betty |
| 2007 | Dalziel and Pascoe | as Aimee Hobbs |
| 2008 | Heartbeat | as Sue Padgett |
| 2009 | Waking the Dead | as Gemma Morrison |
| 2009 | Return to Cranford | as Erminia Whyte |
| 2012 | American Dad | as Narrator (voice) |
| 2013 | Family Guy | as British Woman (voice) |
| 2010-2015 | Downton Abbey | as Lady Mary Crawley |
| 2017 | Angie Tribeca | as Victoria Nova |
| 2016-2017 | Good Behavior | as Letty Raines |
| 2017 | Godless | as Alice Fletcher |
| 2019 | Tuca & Bertie | as Lady Netherfeld (voice) |
| TBA | Defending Jacob | as Laurie Barber |