Alyson Hannigan

Biography

Alyson Lee Hannigan (born March 24, 1974) is an American actress and television presenter. She is best known for her roles as Willow Rosenberg in the television series Buffy the Vampire Slayer (1997–2003), as Lily Aldrin in the sitcom How I Met Your Mother (2005–2014) for which she won a People's Choice Award in 2009, and as Michelle Flaherty in the American Pie film series (1999–2012). Since 2016, Hannigan has hosted the television show Penn & Teller: Fool Us. She also provides the voice of Claire Clancy in the Disney Junior animated series Fancy Nancy (2018–present).

Known For

The Simpsons

American Dad!

American Dad!

American Dad!

Watch What Happens Live with Andy Cohen

The Daily Show

King of the Hill

Rugrats

All Movies (30)

• Solo Mio2026 · as Meghan
• Office Race2023 · as Pat
• Flora & Ulysses2021 · as Phyllis
• Abducted: The Mary Stauffer Story2019 · as Mary Stauffer
• You Might Be the Killer2019 · as Chuck
• Kim Possible2019 · as Dr. Ann Possible
• Man of the House2018 · as Jessie
• Do You Take This Man2017 · as Rachael
• American Reunion2012 · as Michelle Levenstein
• More Business of Being Born2011 · as Self [Part 2,3]
• Love, Wedding, Marriage2011 · as Courtney
• Farce of the Penguins2006 · as Hottie Penguin (voz)
• Date Movie2006 · as Julia Jones
• American Pie: Revealed2004 · as Self
• American Wedding2003 · as Michelle Flaherty
• Beyond the City Limits2001 · as Lexi
• American Pie 22001 · as Michelle Flaherty
• Playboy Mansion Parties Uncensored2001 · as Self
• Boys and Girls2000 · as Betty
• Hayley Wagner, Star1999 · as Jenna Jakes
• American Pie1999 · as Michelle Flaherty
• Dead Man on Campus1998 · as Lucy
• For My Daughter's Honor1996 · as Kelly
• A Case for Life1996 · as Iris
• The Stranger Beside Me1995 · as Dana
• My Stepmother Is an Alien1988 · as Jessie Mills
• Impure Thoughts1986 · as Patty Stubbs
• Dodie & Cheryl Get Hitched— · as Cheryl Crum
• American Pie: Beneath the Crust Vol. 2— · as Self
• How I Met The Robin— · as Lily Aldrin

All TV Shows (58)

• Dancing with the Stars Official Podcast2025 · as Self
• Doogie Kamealoha, M.D.2021 · as Dawn
• Adorableness2021 · as Self
• Outrageous Pumpkins2020 · as Self - Host
• Girl Scout Cookie Championship2020 · as Self - Host
• Outmatched2020 · as Beth
• The Kelly Clarkson Show2019 · as Self
• Fancy Nancy: Fancy It Yourself2019 · as Nancy
• Fancy Nancy2018 · as Claire Clancy (voice)
• The Gong Show2017 · as Self - Judge
• Star Plates2016
• The $100,000 Pyramid2016 · as Self
• Beat Bobby Flay2013 · as Self
• Hollywood Game Night2013 · as Self
• Sofia the First2013 · as (voice)
• Penn & Teller: Fool Us2011 · as Self - Host
• Watch What Happens Live with Andy Cohen2009 · as Self - Guest
• The Goode Family2009
• The Bonnie Hunt Show2008 · as Self
• Buffy the Animated Series2008 · as Willow Rosenberg
• The Megan Mullally Show2006 · as Self - Guest
• I Love the '70s: Volume 22006 · as Self
• The Reichen Show2005 · as Self
• How I Met Your Mother2005 · as Lily Aldrin
• Dancing with the Stars2005 · as Self - Contestant
• Dancing with the Stars2005 · as Self - Audience Member
• Dancing with the Stars2005 · as Self - Rehearsal Visitor
• Robot Chicken2005 · as Steelheart (voice)
• American Dad!2005 · as Lexie (voice)
• American Dad!2005 · as Ugly Stepsister #2 (voice)
• American Dad!2005 · as Chelsea (voice)
• Veronica Mars2004 · as Trina Echolls
• The Ellen DeGeneres Show2003 · as Self
• Pepsi Smash2003 · as Self - Host
• Jimmy Kimmel Live!2003 · as Self
• Jimmy Kimmel Live!2003 · as Self - Guest
• 100 Deeds for Eddie McDowd1999
• Angel1999 · as Willow Rosenberg
• Teen Choice Awards1999 · as Self
• The Late Late Show with Craig Kilborn1999 · as Self - Guest
• The Wild Thornberrys1998 · as Gerda (voice)
• That '70s Show1998 · as Suzy Simpson
• Buffy the Vampire Slayer1997 · as Willow Rosenberg
• King of the Hill1997 · as Stacey Gibson (voice)
• The Daily Show1996 · as Self - Guest
• Touched by an Angel1994 · as Cassie Peters
• Late Night with Conan O'Brien1993 · as Self - Guest
• Late Show with David Letterman1993 · as Self - Guest
• Late Show with David Letterman1993 · as Self - Top Ten Presenter
• Picket Fences1992 · as Peggy Patterson
• MTV Movie & TV Awards1992 · as Self - Presenter
• The Tonight Show with Jay Leno1992
• The Torkelsons1991 · as Samantha
• Rugrats1991 · as Cynthia P.I. (voice)
• The Simpsons1989 · as Melody Juniper (voice)
• Free Spirit1989 · as Jessie Harper
• Roseanne1988
• Entertainment Tonight1981 · as Self