Acting · Washington, District of Columbia, USA · Born March 24, 1974
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).
MovieSolo Mio
2026
as Meghan
TVDancing with the Stars Official Podcast
2025
as Self
MovieOffice Race
2023
as Pat
TVDoogie Kamealoha, M.D.
2021
as Dawn
TVAdorableness
2021
as Self
MovieFlora & Ulysses
2021
as Phyllis
TVOutrageous Pumpkins
2020
as Self - Host
TVGirl Scout Cookie Championship
2020
as Self - Host
TVOutmatched
2020
as Beth
MovieAbducted: The Mary Stauffer Story
2019
as Mary Stauffer
TVThe Kelly Clarkson Show
2019
as Self
MovieYou Might Be the Killer
2019
as Chuck
TVFancy Nancy: Fancy It Yourself
2019
as Nancy
MovieKim Possible
2019
as Dr. Ann Possible
TVFancy Nancy
2018
as Claire Clancy (voice)
Man of the House
2018
as Jessie
MovieDo You Take This Man
2017
as Rachael
TVThe Gong Show
2017
as Self - Judge
TVStar Plates
2016
TVThe $100,000 Pyramid
2016
as Self
TVBeat Bobby Flay
2013
as Self
TVHollywood Game Night
2013
as Self
TVSofia the First
2013
as (voice)
MovieAmerican Reunion
2012
as Michelle Levenstein
MovieMore Business of Being Born
2011
as Self [Part 2,3]
MovieLove, Wedding, Marriage
2011
as Courtney
TVPenn & Teller: Fool Us
2011
as Self - Host
TVWatch What Happens Live with Andy Cohen
2009
as Self - Guest
TVThe Goode Family
2009
TVThe Bonnie Hunt Show
2008
as Self
TVBuffy the Animated Series
2008
as Willow Rosenberg
MovieFarce of the Penguins
2006
as Hottie Penguin (voice)
TVThe Megan Mullally Show
2006
as Self - Guest
TVI Love the '70s: Volume 2
2006
as Self
MovieDate Movie
2006
as Julia Jones
The Reichen Show
2005
as Self
TVHow I Met Your Mother
2005
as Lily Aldrin
TVDancing with the Stars
2005
as Self - Contestant
TVRobot Chicken
2005
as Steelheart (voice)
TVAmerican Dad!
2005
as Lexie (voice)
TVVeronica Mars
2004
as Trina Echolls
MovieAmerican Pie: Revealed
2004
as Self
TVThe Ellen DeGeneres Show
2003
as Self
MovieAmerican Wedding
2003
as Michelle Flaherty
Pepsi Smash
2003
as Self - Host
TVJimmy Kimmel Live!
2003
as Self
MovieBeyond the City Limits
2001
as Lexi
MovieAmerican Pie 2
2001
as Michelle Flaherty
Playboy Mansion Parties Uncensored
2001
as Self
MovieBoys and Girls
2000
as Betty
TV100 Deeds for Eddie McDowd
1999
TVAngel
1999
as Willow Rosenberg
MovieHayley Wagner, Star
1999
as Jenna Jakes
TVTeen Choice Awards
1999
as Self
MovieAmerican Pie
1999
as Michelle Flaherty
TVThe Late Late Show with Craig Kilborn
1999
as Self - Guest
TVThe Wild Thornberrys
1998
as Gerda (voice)
TVThat '70s Show
1998
as Suzy Simpson
MovieDead Man on Campus
1998
as Lucy
TVBuffy the Vampire Slayer
1997
as Willow Rosenberg
TVKing of the Hill
1997
as Stacey Gibson (voice)
MovieFor My Daughter's Honor
1996
as Kelly
TVThe Daily Show
1996
as Self - Guest
A Case for Life
1996
as Iris
MovieThe Stranger Beside Me
1995
as Dana
TVTouched by an Angel
1994
as Cassie Peters
TVLate Night with Conan O'Brien
1993
as Self - Guest
TVLate Show with David Letterman
1993
as Self - Guest
TVPicket Fences
1992
as Peggy Patterson
TVMTV Movie & TV Awards
1992
as Self - Presenter
TVThe Tonight Show with Jay Leno
1992
TVThe Torkelsons
1991
as Samantha
TVRugrats
1991
as Cynthia P.I. (voice)
TVThe Simpsons
1989
as Melody Juniper (voice)
TVFree Spirit
1989
as Jessie Harper
MovieMy Stepmother Is an Alien
1988
as Jessie Mills
TVRoseanne
1988
MovieImpure Thoughts
1986
as Patty Stubbs
TVEntertainment Tonight
1981
as Self
Dodie & Cheryl Get Hitched
as Cheryl Crum
MovieAmerican Pie: Beneath the Crust Vol. 2
as Self
MovieHow I Met The Robin
as Lily Aldrin
