Alyson Hannigan
| Year | Movie | Function | Role |
| 2012 | American Pie 4: American Reunion | actor | Michelle Flaherty-Levenstein |
| 2009 | IMDb - The 61st Primetime Emmy Awards | actor | Herself - Presenter |
| 2006 | Farce of the Penguins | actor | Hottie Penguin (voice) |
| 2006 | Date Movie | actor | Julia Jones |
| 2005 | How I Met Your Mother | actor | Lily Aldrin / ... (145 episodes, 2005-2011) |
| 2003 | Sex at 24 Frames Per Second | actor | Herself (archive footage) |
| 2003 | American Wedding | actor | Michelle Flaherty |
| 2003 | Buffy The Vampire Slayer Season 1 | actor | Willow Rosenberg (144 episodes, 1997-2003) |
| 2003 | Buffy the Vampire Slayer | actor | Willow Rosenberg (144 episodes, 1997-2003) |
| 2001 | American Pie 2 | actor | Michelle Flaherty |
| 2000 | Boys and Girls | actor | Betty |
| 1999 | American Pie | actor | Michelle Flaherty |
| 1998 | Dead Man on Campus | actor | Lucy |
| 1988 | My Stepmother is an Alien | actor | Jessie Mills |