| Date-A-Max | 2013 | Writer | Writer |
| Neighbours | 2023 | Actress | Reece Sinclair |
| Invitation to a Murder | 2023 | Actress | Miranda Green |
| Spree | 2020 | Actress | London Sachs |
| The Basement | 2018 | Actress | Kelly Owen |
| Papa | 2018 | Actress | Jennifer |
| Ouija House | 2018 | Actress | Samantha |
| The Toybox | 2018 | Actress | Samantha |
| Painkillers | 2018 | Actress | The Girl |
| Monsters at Large | 2018 | Actress | Katie Parker |
| Executor | 2017 | Actress | Tara |
| Love Unplugged | 2017 | Actress | Rebecca Jones |
| Mining for Ruby | 2017 | Actress | Jessica King |
| The Malevolent | 2016 | Actress | Ms Lowell |
| Deserted | 2016 | Actress | Jae |
| Recovery Road | 2016 | Actress | Olivia |
| Operator | 2015 | Actress | Pamela Miller |
| L.A. Slasher | 2015 | Actress | The Actress |
| Checkmate | 2015 | Actress | Lauren Campbell |
| American Beach House | 2015 | Actress | Ms. Maureen |
| Hope Lost | 2015 | Actress | Alina |
| The Hoarder | 2015 | Actress | Ella |
| SWAT: Unit 887 | 2015 | Actress | Agent Melanie Hamlin |
| ZK: Elephant's Graveyard | 2015 | Actress | Toni |
| Starcrossed | 2014 | Actress | Kat |
| Throwdown | 2014 | Actress | Lisa Thomas |
| Bhopal: A Prayer for Rain | 2014 | Actress | Eva Gascon |
| Willis Earl Beal: Coming Through Short | 2014 | Actress | Mischa |
| Gutsy Frog | 2013 | Actress | Ms. Monica |
| Date-A-Max | 2013 | Actress | Cammie |
| A Resurrection | 2013 | Actress | Jessie Parker |
| Noel Gallagher's High Flying Birds: Everybody's on the Run | 2012 | Actress | Girl |
| Apartment 1303 3D | 2012 | Actress | Lara Slate |
| I Will Follow You Into the Dark | 2012 | Actress | Sophia Monet |
| Beauty and the Least: The Misadventures of Ben Banks | 2012 | Actress | Amy Warner |
| Cyberstalker | 2012 | Actress | Aiden Ashley |
| Don't Fade Away | 2011 | Actress | Katherine Morrison |
| You and I | 2011 | Actress | Lana |
| Law & Order: Special Victims Unit | 2010 | Actress | Gladys Dalton |
| The Beautiful Life: TBL | 2009 | Actress | Sonja Stone |
| Homecoming | 2009 | Actress | Shelby Mercer |
| Walled In | 2009 | Actress | Sam |
| Famous Magazine: Mischa Barton Commercial Short | 2008 | Actress | Mischa Barton |
| Assassination of a High School President | 2008 | Actress | Francesca Fachini |
| Virgin Territory | 2007 | Actress | Pampinea |
| St. Trinian's | 2007 | Actress | JJ French |
| Closing the Ring | 2007 | Actress | Young Ethel Ann |
| The O.C. | 2003–2006 | Actress | Marissa Cooper |
| The Oh in Ohio | 2006 | Actress | Kristen Taylor |
| Bebe: The Arrival 2005 Commercial Short | 2005 | Actress | |
| Neutrogena: Mischa Barton Commercial V:3 Short | 2005 | Actress | Mischa Barton |
| Mischa Barton JC: Jeans and Clothes Commercial V:3 Short | 2005 | Actress | Mischa |
| Mischa Barton JC: Jeans and Clothes Commercial V:1 Short | 2005 | Actress | Mischa |
| Mischa Barton JC: Jeans and Clothes Commercial V:2 Short | 2005 | Actress | |
| James Blunt: Goodbye My Lover | 2005 | Actress | Girlfrend |
| KEDS: Mischa Barton Commercial Short | 2004 | Actress | |
| Neutrogena: Mischa Barton Commercial V:2 Short | 2003 | Actress | Mischa Barton |
| Neutrogena: Mischa Barton Commercial V:1 Short | 2003 | Actress | Mischa Barton |
| Enrique Iglesias: Addicted | 2003 | Actress | Love Interest |
| Octane | 2003 | Actress | Natasha 'Nat' Wilson |
| Fastlane | 2003 | Actress | Simone Collins |
| A Ring of Endless Light | 2002 | Actress | Vicky Austin |
| Once and Again | 2001–2002 | Actress | Katie Singer |
| Tart | 2001 | Actress | Grace Bailey |
| Julie Johnson | 2001 | Actress | Lisa Johnson |
| Lost and Delirious | 2001 | Actress | Mary 'Mouse' Bedford |
| Frankie & Hazel | 2000 | Actress | Francesca 'Frankie' Humphries |
| Skipped Parts | 2000 | Actress | Maurey Pierce |
| Paranoid | 2000 | Actress | Theresa |
| The Sixth Sense | 1999 | Actress | Kyra Collins |
| Notting Hill | 1999 | Actress | 'Helix' 12-year-old Actress |
| Pups | 1999 | Actress | Rocky |
| An Off-Beats Valentine's | 1999 | Actress | Betty Ann Bongo (voice) |
| KaBlam! | 1996–1997 | Actress | Betty Ann Bongo (voice) |
| Lawn Dogs | 1997 | Actress | Devon Stockard |
| New York Crossing | 1996 | Actress | Drummond |
| All My Children | 1995 | Actress | Lily |
| Polio Water | 1995 | Actress | Diane |
| CNN Special Reports | 2021 | Self | Self |
| The Hills: New Beginnings | 2019 | Self | Self (as Mischa) |
| Entertainment Tonight | 2008–2019 | Self | Self |
| The Cast of The Hills: New Beginnings Goes Head-to-Head in OG Hills Trivia Short | 2019 | Self | Self |
| The Scarlet Letter Reports TV Series | 2018 | Self | Self |
| Hollywood Medium | 2017 | Self | Self |
| Battle of the Network Stars | 2017 | Self | Self - Contestant |
| The View | 2005–2017 | Self | Self |
| Dr. Phil | 2017 | Self | Self |
| Joyride | 2016 | Self | Self |
| Hollywood Today Live | 2016 | Self | Self |
| Dancing with the Stars | 2016 | Self | Self - Contestant |
| Young Hollywood | 2016 | Self | Self |
| Extra | 2016 | Self | Self |
| Good Morning America | 2016 | Self | Self - Guest |
| Fashion Police | 2012 | Self | Self |
| Chris Moyles Quiz Night | 2010 | Self | Self |
| Fearne and... | 2010 | Self | Self |
| The 2009 Whitney Museum Gala | 2009 | Self | Self |
| T4 | 2009 | Self | Self |
| Germany's Next Topmodel | 2009 | Self | Self |
| Gok's Fashion Fix | 2008 | Self | Self |
| Frånvarande TV Series | 2008 | Self | Self |
| Hotel Gramercy Park | 2008 | Self | Self |
| Cinema 3 | 2008 | Self | Self |
| Cartelera | 2008 | Self | Self |
| Buenafuente | 2008 | Self | Self |
| Alive & Well with Michelle Harris | 2008 | Self | Self |
| Where Music Meets Film TV Movie | 2008 | Self | Self |
| Fashion Rocks | 2007 | Self | Self |
| British Film Forever | 2007 | Self | Self |
| Fashion News Live | 2007 | Self | Self |
| The Dame Edna Treatment | 2007 | Self | Self - Special Guest |
| The 64th Annual Golden Globe Awards | 2007 | Self | Self |
| THS Investigates | 2006 | Self | Self |
| The Teen Choice Awards 2006 | 2006 | Self | Self - Winner |
| The Friday Night Project | 2006 | Self | Self - Guest Host |
| The Bigger Picture | 2006 | Self | Self |
| Jimmy Kimmel Live! | 2003–2006 | Self | Self |
| Late Show with David Letterman | 2004–2006 | Self | Self |
| The 63rd Annual Golden Globe Awards 2006 | 2006 | Self | Self |
| Tricky TV | 2005 | Self | Self |
| 3rd Irish Film and Television Awards | 2005 | Self | Self - Presenter |
| MTV Europe Music Awards 2005 | 2005 | Self | Self - In James Blunt's Video Message (uncredited) |
| Punk'd | 2005 | Self | Self |
| The 57th Annual Primetime Emmy Awards | 2005 | Self | Self - Presenter |
| The Ellen DeGeneres Show | 2004–2005 | Self | Self |
| Balls of Steel | 2005 | Self | Self |
| The Teen Choice Awards 2005 | 2005 | Self | Self - Presenter |
| The Tonight Show with Jay Leno | 2004–2005 | Self | Self |
| Live with Kelly and Mark | 2003–2005 | Self | Self - Guest |
| The Orange British Academy Film Awards | 2005 | Self | Self |
| The 62nd Annual Golden Globe Awards 2005 | 2005 | Self | Self - Presenter |
| The Tony Danza Show | 2004 | Self | Self |
| Total Request Live | 2003–2004 | Self | Self |
| The O.C.: A Day in the Life | 2004 | Self | Self |
| The 56th Annual Primetime Emmy Awards | 2004 | Self | Self |
| The Oprah Winfrey Show | 2004 | Self | Self |
| The O.C.: Obsess Completely | 2004 | Self | Self |
| The Teen Choice Awards 2004 | 2004 | Self | Self - winner |
| On-Air with Ryan Seacrest | 2004 | Self | Self |
| Nickelodeon Kids' Choice Awards '04 | 2004 | Self | Self |
| Late Night with Conan O'Brien | 2004 | Self | Self - Guest |
| The 61st Annual Golden Globe Awards | 2004 | Self | Self |
| The 30th Annual People's Choice Awards | 2004 | Self | Self |
| Jingleball Rock | 2003 | Self | Self |
| The 2003 Billboard Music Awards | 2003 | Self | Self |
| Last Call with Carson Daly | 2002–2019 | Self | Self |
| The Teen Choice Awards 2003 | 2003 | Self | Self |
| One Shot | 2003 | Self | Self |
| VH1/Vogue Fashion Awards | 2000 | Self | Self |
| Entertainment Tonight | 2016–2024 | Archive Footage | Self (archive footage) |
| Entertainment Tonight Canada | 2022 | Archive Footage | Self - 2015 (archive footage) |
| The Hills: New Beginnings | 2019 | Archive Footage | Self (archive footage, as Mischa) |
| Celebrity Page | 2018 | Archive Footage | Self (archive footage) |
| Extra | 2016–2017 | Archive Footage | Self (archive footage) |
| Inside Edition | 2016 | Archive Footage | Self (archive footage) |
| The Wright Stuff | 2014 | Archive Footage | Self (archive footage) |
| 20 to 1 | 2010 | Archive Footage | Self - Actress (archive footage) |
| Forbes 20 Under 25: Young, Rich and Famous | 2007 | Archive Footage | Self (archive footage) |
| The O.C. | 2006–2007 | Archive Footage | Marissa Cooper (archive footage, uncredited) |
| Sex, Lies & Soaps | 2006 | Archive Footage | Marissa Cooper (archive footage, uncredited) |
| VH1 News Presents | 2006 | Archive Footage | Self (archive footage) |
| The O.C. Season 1: Gag Reel Video | 2005 | Archive Footage | Marissa Cooper (archive footage) |