Janet Kidder is the niece of actress Margot Kidder.
| Year | Title | Role | Notes |
|---|
| 1997 | {{sortname>The|Absolute Truth|nolink=1}} | Co-Ed | TV film |
| 1997 | Bad to the Bone | Phoebe | TV film |
| 1998 | Thanks of a Grateful Nation | Rosca | TV film |
| 1998 | {{sortname>The|Girl Next Door|nolink=1}} | Deputy Colleen | TV film |
| 1998–99 | La Femme Nikita | Vizcano / Roberta (young) | Episodes: "First Mission", "Walk on By" |
| 1998–2000 | Made in Canada | Lisa Sutton | Main role (seasons 1–2) |
| 1999 | Psi Factor | Christine Ambrose | Episodes: "Y2K", "Forever and a Day: Part 1" |
| 1999 | Final Conflict | Julia Cook | Recurring role (season 2) |
| 1999 | Sea People | Ms. Busby | TV film |
| 2000 | Strong Medicine | Episode: "Pilot" |
| 2000 | Blessed Stranger: After Flight 111 | Cheryl Barkhouse | TV film |
| 2001 | {{sortname>A|Mother's Fight for Justice|nolink=1}} | TV film |
| 2001 | {{sortname>The|Big Heist}} | Maria | TV film |
| 2002–2004 | Tom Stone | Cpl. Marina Del Luzio | Main role |
| 2003 | Defending Our Kids: The Julie Posey Story | Cassandra Harris | TV film |
| 2004 | Casualty | Pippa Parker | Episode: "Three's a Crowd" |
| 2005 | Doctors | Francesca Rodriguez | Episodes: "For the Best: Parts 1 & 2" |
| 2007 | Superstorm | TV Interviewer | TV miniseries |
| 2010 | Supernatural | Mandy Duren | Episode: "All Dogs Go to Heaven" |
| 2011 | {{sortname>The|Legend of Dick and Dom}} | Vorderman | Episode: "Valley of the Bigheads" |
| 2011 | Magic Beyond Words: The J.K. Rowling Story | Anne Rowling | TV film |
| 2011 | Innocent | Marta | TV film |
| 2012 | Fringe | Dr. Brody | Episode: "Making Angels" |
| 2012 | {{sortname>The|Killing|The Killing (U.S. TV series)}} | Dr. Carey | Episode: "72 Hours" |
| 2012 | Ring of Fire | Anna Janen | Episode: "Night 2" |
| 2012–2014 | Continuum | Ann Sadler | Recurring role (seasons 1–3) |
| 2013 | Motive | Melinda | Episode: "Detour" |
| 2013 | Rogue | Nancy | Episodes: "Fireball", "Sweet and Sour", "Hawala" |
| 2013 | Delete | Elizabeth Hardington | TV miniseries |
| 2014 | Gracepoint | Sara Burke | Recurring role |
| 2015 | Garage Sale Mystery: The Deadly Room | Adrian | TV film |
| 2015 | Rookie Blue | Sylvia Blake | Episode: "Ninety Degrees" |
| 2015–16 | Arrow | Ruvé Adams | Recurring role (season 4) |
| 2016 | {{sortname>The|X-Files}} | Nurse | Episode: "Babylon" |
| 2016 | Dead of Summer | Waitress / Mrs. Sykes | Episodes: "Barney Rubble Eyes", "The Dharma Bums", "Townie" |
| 2016 | Aftermath | Aunt Sally | Guest role |
| 2017 | Cop and a Half: New Recruit | Captain | TV film |
| 2017 | Somewhere Between | Marjorie Spencer | Episodes: "For One to Live", "One Must Die" |
| 2018 | Cooking with Love | Amanda | TV film |
| 2018 | Signed, Sealed, Delivered: To the Altar | Annaliese | TV film |
| 2018 | {{sortname>The|Man in the High Castle|The Man in the High Castle (TV series)}} | Lila Jacobs | Recurring role (season 3) |