| Movie | 2004 | Eternal Sunshine of the Spotless Mind | Patrick | |
| Movie | 2001 | The Lord of the Rings: The Fellowship of the Ring | Frodo | |
| Movie | 2002 | The Lord of the Rings: The Two Towers | Frodo | |
| Movie | 2003 | The Lord of the Rings: The Return of the King | Frodo | |
| Movie | 1989 | Back to the Future Part II | Video Game Boy | |
| Movie | 2005 | Sin City | Kevin | |
| Movie | 2005 | Everything Is Illuminated | Jonathan Safran Foer | |
| Movie | 2002 | The Cranberries - Stars: The Best Videos 1992-2002 | Boy with Hearphones (segment "Ridiculous Thoughts") | |
| Movie | 2006 | Paris Je T'aime | Le garçon (Quartier de la Madeleine) | |
| Movie | 1990 | Avalon | Michael Kaye | |
| Movie | 1992 | Forever Young | Nat Cooper | |
| Movie | 2006 | Bobby | William Avary | |
| Movie | 1990 | Internal Affairs | Sean Stretch | |
| Movie | 2001 | Chain of Fools | Mikey | |
| Movie | 1992 | Radio Flyer | Mike | |
| Movie | 1994 | North | North | |
| Movie | 1998 | Deep Impact | Leo Biederman | |
| Movie | 2005 | Green Street Hooligans | Matt Buckner | |
| Movie | 2002 | Ash Wednesday | Sean Sullivan | |
| Movie | 2009 | 9 | #9 (voice) | |
| Movie | 2008 | The Oxford Murders | Martin | |
| Movie | 2003 | Spy Kids 3-D: Game Over | The Guy | |
| Movie | 1993 | The Good Son | Mark Evans | |
| Movie | 1998 | The Faculty | Casey Connor | |
| Movie | 2006 | Happy Feet | Mumble (voice) | |
| Movie | 1993 | The Adventures of Huck Finn | Huck Finn | |
| Movie | 2010 | The Romantics | Chip | |
| Movie | 1996 | Flipper | Sandy Ricks | |
| Movie | 2002 | Try Seventeen | Jones | |
| Movie | 2003 | The Adventures of Tom Thumb and Thumbelina | Tom Thumb (voice) | |
| Movie | 2011 | Fight for Your Right Revisited | Ad-Rock (B-Boys 1) | |
| Movie | 2007 | Day Zero | Aaron Feller | |
| Movie | 1992 | The Witness | Little Boy | |
| Movie | 2012 | The Hobbit: An Unexpected Journey | Frodo Baggins | |
| Movie | 2011 | Happy Feet Two | Mumble (voice) | |
| Movie | 1997 | Oliver Twist | The Artful Dodger | |
| Movie | 1991 | Paradise | Willard Young | |
| Movie | 1997 | The Ice Storm | Mikey Carver | |
| Movie | 2005 | Ringers: Lord of the Fans | Self | |
| Movie | 1994 | The War | Stu Simmons | |
| Movie | 2010 | The Heart is a Drum Machine | Self | |
| Movie | 2008 | Operation Filmmaker | Self | |
| Movie | 2012 | Celeste & Jesse Forever | Scott | |
| Movie | 2000 | The Bumblebee Flies Anyway | Barney Snow | |
| Movie | 2012 | Maniac | Frank Zito | |
| Movie | N/A | L.A. Rush | | |
| Movie | 2024 | Bookworm | Strawn Wise | |
| Movie | 2014 | Open Windows | Nick Chambers | |
| Movie | 2015 | Henry | | |
| Movie | 1990 | Child in the Night | Luke | |
| Movie | 2004 | Frodo Is Great... Who Is That?!! | Self | |
| Movie | 2012 | Revenge for Jolly! | Thomas | |
| Movie | 2013 | Maniac: The Making of Documentary | Self | |
| Movie | 2013 | Pawn Shop Chronicles | Johnny Shaw | |
| Movie | 2013 | Grand Piano | Tom Selznick | |
| Movie | 2014 | Cooties | Clint | |
| Movie | 2013 | Setup, Punch | Reuben Stein | |
| Movie | 2011 | Nightmare Factory | Self | |
| Movie | 1992 | Day-O | Day-O | |
| Movie | 2015 | The Last Witch Hunter | Dolan 37th | |
| Movie | 2014 | Set Fire to the Stars | John M. Brinnin | |
| Movie | 2013 | This Must Be the Only Fantasy | Trevor | |
| Movie | 2015 | Made in Japan | Self (voice) | |
| Movie | 2013 | Tome of the Unknown | Wirt (voice) | |
| Movie | 2023 | The Elephant 6 Recording Co. | Self | |
| Movie | N/A | Disney's Safety Hits Volume 1: Bike Safety With Bill Nye The Science Guy & I'm No Fool On Wheels | Pinocchio | |
| Movie | 2010 | WWII in HD: The Air War | Andy Rooney (voice) | |
| Movie | 2016 | The Trust | David Waters | |
| Movie | 2025 | The Monkey | Ted | |
| Movie | 2013 | Mundos virtuales | | |
| Movie | 1999 | Black and White | Wren | |
| Movie | 2012 | The Narrative of Victor Karloch | William Merriwether | |
| Movie | 2012 | The Ballad Of Danko Jones | Mouse | |
| Movie | 2004 | A Filmmaker's Journey: Making 'The Return of the King' | Self | |
| Movie | 2003 | The Making of 'The Long and Short of It' | Self | |
| Movie | 2003 | Beyond the Movie: The Return of the King | Self | |
| Movie | 2023 | Tony Pizzas Tony Pizzas | Elijah Wood | |
| Movie | 2017 | I Don't Feel at Home in This World Anymore | Tony | |
| Movie | 2017 | 78/52 | Self | |
| Movie | 2001 | Quest for the Ring | Self | |
| Movie | 2001 | Passage to Middle-Earth: The Making of 'The Lord of the Rings' | Self | |
| Movie | 2018 | The Panama Papers | John Doe (voice) | |
| Movie | 2009 | Beyond All Boundaries | Corp. Wilfred Hanson / Capt. John C. Chapin | |
| Movie | 2003 | The Quest Fulfilled: A Director's Vision | Self | |
| Movie | 2019 | Come to Daddy | Norval Greenwood | |
| Movie | 2001 | Beyond the Movie: The Fellowship of the Ring | Self | |
| Movie | 2011 | Boobie | James | |
| Movie | 2014 | Why Horror? | Animation VO (voice) | |
| Movie | 2005 | I’m Still Here: Real Diaries of Young People Who Lived During the Holocaust | Klaus Langer / Dawid Rubinowicz (voice) | |
| Movie | 2021 | No Man of God | Bill Hagmaier | |
| Movie | 2015 | Behind Over the Garden Wall | Self | |
| Movie | 2020 | Solar Noise | Self (archive footage) | |
| Movie | 2002 | The Making of 'The Fellowship of the Ring' | Self | |
| Movie | 2025 | The Toxic Avenger Unrated | Fritz Garbinger, his Creepy Brother | |
| Movie | 2013 | A Band Called Death | Self | |
| Movie | 2003 | The Making of 'The Two Towers' | | |
| Movie | 2004 | The Making of 'The Return of the King' | Self | |
| Movie | 2017 | The Postman Dreams 2 | | |
| Movie | 2026 | Ready or Not 2: Here I Come | The Lawyer | |
| Movie | 2027 | The Lord of the Rings: The Hunt for Gollum | Frodo Baggins | |
| Movie | 2012 | Treasure Island | Ben Gunn | |
| TV Show | 2005 | American Dad! | Ethan (voice) | 1 |
| TV Show | 1999 | Family Guy | Elijah Wood (voice) | 1 |
| TV Show | 2003 | Jimmy Kimmel Live! | Self | 1 |
| TV Show | 1996 | The Daily Show | Self | 1 |
| TV Show | 1997 | King of the Hill | Jason (voice) | 1 |
| TV Show | 2005 | The Friday Night Project | Self - Host | 1 |
| TV Show | 2003 | Punk'd | Self | 1 |
| TV Show | 2005 | Jack Osbourne: Adrenaline Junkie | | 1 |
| TV Show | 1992 | The Tonight Show with Jay Leno | | 1 |
| TV Show | 1993 | Frasier | Ethan (voice) | 1 |
| TV Show | 2005 | The Colbert Report | | 1 |
| TV Show | 2015 | The Late Show with Stephen Colbert | Self | 1 |
| TV Show | 1993 | Late Night with Conan O'Brien | Self - Guest | 4 |
| TV Show | 2007 | Yo Gabba Gabba! | | 1 |
| TV Show | 2009 | Glenn Martin, DDS | Chester Chislehurst | 40 |
| TV Show | 2021 | Yellowjackets | Walter (voice only) | 14 |
| TV Show | 2014 | The Tonight Show Starring Jimmy Fallon | Self | 1 |
| TV Show | 1953 | The Oscars | Self | 1 |
| TV Show | 1998 | TRL | | 1 |
| TV Show | 2013 | Peter Panzerfaust | Peter | 1 |
| TV Show | 2012 | TRON: Uprising | Beck | 18 |
| TV Show | 2003 | Red vs. Blue | Sigma | 41 |
| TV Show | 1975 | Saturday Night Live | Self - Host | 1 |
| TV Show | 2011 | Wilfred | Ryan Newman | 49 |
| TV Show | 2015 | Hot Ones | Self | 1 |
| TV Show | 2006 | Freak Show | Freak Mart Squirrel | 1 |
| TV Show | 2005 | Made in Hollywood | Self | 1 |
| TV Show | 2014 | Over the Garden Wall | Wirt (voice) | 10 |
| TV Show | 1993 | Homicide: Life on the Street | | 1 |
| TV Show | 1981 | Wetten, dass..? | Self | 1 |
| TV Show | 2014 | Late Night with Seth Meyers | Self | 3 |
| TV Show | 2016 | Join or Die with Craig Ferguson | Self | 1 |
| TV Show | 1975 | Saturday Night Live | Self - Cameo (uncredited) | 1 |
| TV Show | 2017 | Talking with Chris Hardwick | Self | 1 |
| TV Show | 2012 | Treasure Island | Ben Gunn | 2 |
| TV Show | 2016 | Dirk Gently's Holistic Detective Agency | Todd Brotzman | 18 |
| TV Show | 2007 | The Graham Norton Show | Self | 2 |
| TV Show | 2022 | The Afterparty | 'Yasper' | 1 |
| TV Show | 1997 | The Wonderful World of Disney | The Artful Dodger | 1 |
| TV Show | 2018 | Eli Roth's History of Horror | Self | 2 |
| TV Show | 2020 | Home Movie: The Princess Bride | Prince Humperdinck | 1 |
| TV Show | 2012 | Double Fine Adventure | Himself | 1 |
| TV Show | 2018 | Star Wars Resistance | Jace Rucklin (voice) | 10 |
| TV Show | N/A | Among Us | Green (voice) | 1 |
| TV Show | 1996 | Adventures from the Book of Virtues | Icarus (voice) | 1 |
| TV Show | 2009 | Watch What Happens Live with Andy Cohen | Self - Guest | 2 |
| TV Show | 2001 | Primetime Glick | | 1 |
| TV Show | 2014 | Off Camera with Sam Jones | Self | 1 |
| TV Show | 2020 | Reunited Apart | Self | 1 |
| TV Show | 2018 | Summer Camp Island | Saxophone (voice) | 6 |
| TV Show | 1997 | Taff | self | 1 |
| TV Show | 2010 | Conan | Self | 2 |
| TV Show | 1994 | Exclusiv - Das Star-Magazin | self | 1 |
| TV Show | 2023 | I'm a Virgo | Studious Guy | 1 |
| TV Show | 2002 | The Osbournes | Self | 1 |
| TV Show | 2025 | E.B. White's Charlotte's Web | Adult Wilbur (voice) | 3 |
| TV Show | 2025 | I Love LA | Elijah Wood | 1 |