| The Recipe Files | 2023 | Actress | Kate |
| Space Dogs: Adventure to the Moon | 2014 | Actress | Strelka (voice) |
| Pawn Shop Chronicles | 2013 | Actress | Theresa |
| Ashlee Simpson: Bat for a Heart Music Video | 2012 | Actress | Ashlee Simpson |
| Melrose Place | 2009–2010 | Actress | Violet Foster (as Ashlee Simpson-Wentz) |
| CSI: NY | 2009 | Actress | Lila Wickfield (as Ashlee Simpson-Wentz) |
| Ashlee Simpson: Outta My Head (Ay Ya Ya) | 2007 | Actress | Ashlee Simpson |
| Ashlee Simpson: Invisible | 2006 | Actress | Ashlee Simpson |
| Ashlee Simpson: L.O.V.E. | 2005 | Actress | Ashlee Simpson |
| Ashlee Simpson: Boyfriend | 2005 | Actress | Ashlee Simpson |
| Undiscovered | 2005 | Actress | Clea |
| Icebreakers: Spa Day Short | 2004 | Actress | |
| Ashlee Simpson: La La | 2004 | Actress | Ashlee Simpson |
| Ashlee Simpson: Shadow | 2004 | Actress | Ashlee Simpson |
| Ashlee Simpson: Pieces of Me | 2004 | Actress | Ashlee Simpson |
| 7th Heaven | 2002–2004 | Actress | Cecilia Smith |
| The Hot Chick | 2002 | Actress | Monique |
| Malcolm in the Middle | 2001 | Actress | High School Girl |
| Ashlee+Evan | 2018 | Producer | executive producer |
| Dope Thief | 2025 | Soundtrack | performer: "Pieces of Me" |
| The Last Airbender | 2010 | Soundtrack | performer: "La La" |
| Youth in Revolt | 2009 | Soundtrack | performer: "L.O.V.E." |
| The House Bunny | 2008 | Soundtrack | performer: "Boys" |
| EastEnders | 2008 | Soundtrack | performer: "Boyfriend" |
| Bratz | 2007 | Soundtrack | performer: "Invisible" |
| SingStar Pop | 2007 | Soundtrack | performer: "Invisible" |
| Elite Beat Agents | 2006 | Soundtrack | writer: "La La" |
| Lucky Louie | 2006 | Soundtrack | performer: "Boyfriend" |
| Ashlee Simpson: I Am Me Video | 2005 | Soundtrack | performer: "Pieces Of Me", "Nothing New", "Shadow", "Autobiography", "La La" |
| One Tree Hill | 2005 | Soundtrack | performer: "Boyfriend" |
| Karaoke Revolution Party | 2005 | Soundtrack | Soundtrack ("Pieces Of Me") |
| Idols | 2005 | Soundtrack | writer: "Pieces of Me" |
| Undiscovered | 2005 | Soundtrack | performer: "Smart in a Stupid Way", "That's Why I Love You", "Undiscovered" |
| Smallville | 2005 | Soundtrack | performer: "La La" |
| Las Vegas | 2005 | Soundtrack | performer: "Lala" |
| Idool 2004 | 2004 | Soundtrack | writer: "Pieces of Me" |
| Saturday Night Live | 2004 | Soundtrack | performer: "Jude" |
| Freaky Friday | 2003 | Soundtrack | performer: "Just Let Me Cry" |
| Celebrity Family Food Battle | 2024 | Self | Self - Contestant |
| Entertainment Tonight | 2007–2024 | Self | Self |
| Paris in Love | 2023 | Self | Self |
| The Jennifer Hudson Show | 2023 | Self | Self |
| BTS of Fashion News Live TV Mini Series | 2022 | Self | |
| Hollywood Houselift with Jeff Lewis | 2022 | Self | Self |
| About Last Night | 2022 | Self | Self |
| Teens Wanna Know | 2021 | Self | Self |
| Cribs | 2021 | Self | Self |
| The Drew Barrymore Show | 2021 | Self | Self - Guest (as Ashlee Simpson Ross) |
| The Bachelor Presents: Listen to Your Heart | 2020 | Self | Self - Judge (as Ashlee Simpson Ross) |
| 2020 Golden Globe Awards | 2020 | Self | Self (uncredited) |
| Drop the Mic | 2019 | Self | Self |
| The Real | 2018 | Self | Self |
| MTV Europe Music Awards 2018 | 2018 | Self | Self - Presenter |
| The Domenick Nati Show | 2018 | Self | Self (voice) |
| GMA3: What You Need to Know | 2018 | Self | Self - Guest |
| American Music Awards 2018 | 2018 | Self | Self - Presenter (as Ashlee Simpson-Ross) |
| Home & Family | 2018 | Self | Self |
| Larry King Now | 2018 | Self | Self |
| Ashlee+Evan | 2018 | Self | Self |
| The Talk | 2018 | Self | Self |
| Watch What Happens Live with Andy Cohen | 2018 | Self | Self - Guest |
| Watch What Happens Live with Andy Cohen | 2018 | Self | Self |
| Good Morning America | 2005–2018 | Self | Self - Guest |
| 2018 Billboard Music Awards | 2018 | Self | Self - Presenter |
| E! Live from the Red Carpet | 2018 | Self | Self (as Ashlee Simpson-Ross) |
| The Raw Word | 2018 | Self | Self - Guest |
| Martha & Snoop's Potluck Party Challenge | 2017 | Self | Self |
| Extra | 2014 | Self | Self |
| The 3rd Annual for the Love of R&B Live Music Event in Hollywood TV Special | 2014 | Self | Self |
| Fashion News Live | 2013 | Self | Self |
| Rachael Ray | 2009–2011 | Self | Self |
| America's Next Top Model | 2011 | Self | Self - Guest Judge & Recording Artist |
| Jessica Simpson: Happy Christmas | 2010 | Self | Self - Special Guest (as Ashlee Simpson-Wentz) |
| The Jay Leno Show | 2009 | Self | Self (as Ashlee Simpson-Wentz) |
| Late Night with Jimmy Fallon | 2009 | Self | Self (as Ashlee Simpson-Wentz) |
| MTV Australia Awards 2009 TV Special | 2009 | Self | Self (as Ashlee Simpson-Wentz) |
| Dog Whisperer with Cesar Millan | 2008 | Self | Self (as Ashlee Simpson-Wentz) |
| 2008 MTV Video Music Awards | 2008 | Self | Self (as Ashlee Simpson-Wentz) |
| Bravo Super Show TV Series | 2008 | Self | Self |
| Loose Women | 2008 | Self | Self - Performer |
| The Ellen DeGeneres Show | 2005–2008 | Self | Self |
| Jimmy Kimmel Live! | 2004–2008 | Self | Self |
| The Tonight Show with Jay Leno | 2004–2008 | Self | Self - Musical Guest |
| 24/7 Chicago TV Series | 2008 | Self | Self (as Ashlee Simpson-Wentz) |
| Nickelodeon Kids' Choice Awards 2008 | 2008 | Self | Self (as Ashlee Simpson-Wentz) |
| AT&T Blue Room | 2008 | Self | Self |
| 2007 MTV Video Music Awards | 2007 | Self | Self |
| Fashion Rocks | 2007 | Self | Self |
| The Teen Choice Awards 2007 | 2007 | Self | Self - Presenter |
| 2006 American Music Awards | 2006 | Self | Self - Presenter |
| Style Star | 2006 | Self | Self |
| The Sharon Osbourne Show | 2006 | Self | Self |
| This Morning | 2006 | Self | Self |
| The Charlotte Church Show | 2006 | Self | Self |
| 2006 MTV Video Music Awards | 2006 | Self | Self |
| MTV Australia Video Music Awards 2006 | 2006 | Self | Self - Host |
| The Kelly Slater Celebrity Surf Invitational TV Special | 2006 | Self | Self |
| Top of the Pops | 2004–2006 | Self | Self |
| Ashlee Simpson: I Am Me Video | 2005 | Self | Self |
| The 2005 Billboard Music Awards | 2005 | Self | Self |
| 60 Minutes | 2004–2005 | Self | Self - Singer (segment "Howard Stern") |
| The View | 2005 | Self | Self |
| Late Show with David Letterman | 2004–2005 | Self | Self |
| Larry King Live | 2005 | Self | Self |
| Today | 2005 | Self | Self |
| Live with Kelly and Mark | 2004–2005 | Self | Self |
| Saturday Night Live | 2004–2005 | Self | Self - Musical Guest |
| 2005 MTV Video Music Awards | 2005 | Self | Self - Presenter |
| The Teen Choice Awards 2005 | 2005 | Self | Self - Attendee |
| E! True Hollywood Story | 2005 | Self | Self (as Ashlee Simpson-Wentz) |
| 2005 MuchMusic Video Awards | 2005 | Self | Self - Performer |
| Punk'd | 2005 | Self | Self |
| The Ashlee Simpson Show | 2005 | Self | Self |
| Newlyweds: Nick & Jessica | 2003–2005 | Self | Self |
| The VIP | 2005 | Self | Self - Musical Guest |
| Interaktiv | 2004 | Self | Self |
| New Year's Rockin' Eve 2005 | 2004 | Self | Self - Co-Host |
| The 6th Annual 'A Home for the Holidays' | 2004 | Self | Self |
| The 2004 Billboard Music Awards | 2004 | Self | Self |
| Nick & Jessica's Family Christmas | 2004 | Self | Self |
| 2004 Radio Music Awards | 2004 | Self | Self - Performer |
| CD:UK | 2004 | Self | Self |
| Top of the Pops Saturday | 2004 | Self | Self |
| The Best Hit USA | 2004 | Self | Self |
| 2004 MTV Video Music Awards | 2004 | Self | Self |
| The Teen Choice Awards 2004 | 2004 | Self | Self |
| MTV Movie Awards 2004 Pre-Show | 2004 | Self | Self - Co-Host |
| 2004 MTV Movie Awards | 2004 | Self | Self |
| Total Request Live | 2003–2004 | Self | Self |
| The 61st Annual Golden Globe Awards | 2004 | Self | Self |
| The Teen Choice Awards 2003 | 2003 | Self | Self |
| MTV Bash: Carson Daly | 2003 | Self | Self |
| DreamChaser Tour | 2002 | Self | Self |
| Jessica Simpson and Jason Raize in Concert | 2000 | Self | Self |
| Say What? Karaoke | 1999 | Self | Self |
| MuchOnDemand | 1997–2010 | Self | Self - Guest |
| Ladies & Gentlemen... 50 Years of SNL Music | 2025 | Archive Footage | Self - Musical Guest October 23, 2004 (archive footage) |
| Entertainment Tonight | 2014–2024 | Archive Footage | Self (archive footage) |
| Dish Nation | 2024 | Archive Footage | Self (archive footage) |
| Hollywood Houselift with Jeff Lewis | 2022–2023 | Archive Footage | Self (archive footage) |
| For Real: The Story of Reality TV | 2021 | Archive Footage | Self (archive footage) |
| Video on Trial | 2005–2007 | Archive Footage | Self |
| Overrated in '06 | 2006 | Archive Footage | Self (archive footage) |
| Access Hollywood | 2006 | Archive Footage | Self (archive footage) |
| Brain Fart | 2005 | Archive Footage | Self (archive footage) |
| Last Laugh '04 | 2004 | Archive Footage | Self (archive footage) |