| Year | Title | Role | Notes |
| 1984–1985 | The Kids of Degrassi Street | Melanie | "Liz Sits the Schlegels", "Martin Meets the Pirates" |
| 1985 | The Littlest Hobo | Lisa Farrell | "Voyageurs: Parts 1 & 2" |
| 1986 | The Elephant Show | Rachel | "Masquerade" |
| Alex: The Life of a Child | Wendy | TV film |
| 1988 | Glory Enough for All | Melanie |
| 1988–1990 | War of the Worlds | Debi McCullough | Regular role |
| 1990 | The Campbells | Bonnie | "Back to School" |
| The Hitchhiker | Karen | "Riding the Nightmare" |
| Clarence | Jill | TV film |
| 1992–1993 | Are You Afraid of the Dark? | Kristen | Main role |
| 1993–1995 | Chris Cross | Dinah McGee |
| 1995 | Young Ivanhoe | Rowena | TV film |
| 1996 | Flash Forward | Ellen Fisher | "No More Good Days", "House Party", "Cool Book" |
| 1996–1999 | Clueless | Cher Horowitz | Lead role |
| 2002–2004 | 7th Heaven | Roxanne Richardson | Regular role (seasons 7–8) |
| 2004–2007 | Peep Show | Nancy | Recurring role |
| 2005 | 1/4life | Lisa | TV film |
| Joey | Joelle | "Joey and the Fancy Sister" |
| 2006 | Our Thirties | Jessica | TV short |
| 2007 | Flight of the Conchords | Sally | "Sally", "Sally Returns" |
| 2008 | Anne of Green Gables: A New Beginning | Louisa Thomas | TV film |
| 2009 | Everything She Ever Wanted | Rachel Reede | TV miniseries |
| 2010 | Call Me Fitz | Janet | "Going Down Syndrome" |
| 2011 | Flashpoint | Jackie Emery | "I'd Do Anything" |
| The Case for Christmas | Lauren | TV film |
| 2012 | Wedding Band | Tracy | "We Are Family" |
| 2013 | The Surrogacy Trap | Mallory Parkes | TV film |
| Legit | Allie | "Cuckoo's Nest", "Hat Hair" |
| Psych | Laura | "Juliet Wears the Pantsuit" |
| 2014 | My Gal Sunday | Sunday O'Brien-Parker | TV film |
| Fargo | Kitty Nygaard | Recurring role |
| 2015 | Childrens Hospital | Missy | "Kick Me" |
| Another Period | Wedding Guest / Clambake Guest | "Reject's Beach", "Modern Pigs" |
| 2016–2020 | You Me Her | Emma Trakarsky | Main role |
| 2022–2025 | The Summer I Turned Pretty | Susannah Fisher | Main role |