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).
Doogie Kamealoha, M.D.
Dawn · (1 episode)
2021
American Pie
Michelle Flaherty
1999
Dodie & Cheryl Get Hitched
Cheryl Crum
Solo Mio
2026
Office Race
Pat
2023
Adorableness
Self · (10 episodes)
2021
Flora & Ulysses
Phyllis
2021
Outrageous Pumpkins
Self - Host · (8 episodes)
2020
Girl Scout Cookie Championship
Self - Host · (4 episodes)
2020
Outmatched
Beth · (1 episode)
2020
Abducted: The Mary Stauffer Story
Mary Stauffer
2019
The Kelly Clarkson Show
(1 episode)
2019
You Might Be the Killer
Chuck
2019
Fancy Nancy: Fancy It Yourself
Nancy · (20 episodes)
2019
Kim Possible
Dr. Ann Possible
2019
Fancy Nancy
Claire Clancy (voice) · (123 episodes)
2018
Do You Take This Man
Rachael
2017
The Gong Show
Self - Judge · (1 episode)
2017
Star Plates
(6 episodes)
2016
The $100,000 Pyramid
Self · (1 episode)
2016
Beat Bobby Flay
Self · (1 episode)
2013
Hollywood Game Night
Self · (1 episode)
2013
Sofia the First
(voice) · (1 episode)
2013
American Reunion
Michelle Flaherty-Levenstein
2012
More Business of Being Born
Self [Part 2,3]
2011
Love, Wedding, Marriage
Courtney
2011
Penn & Teller: Fool Us
Self - Host · (109 episodes)
2011
Watch What Happens Live with Andy Cohen
Self - Guest · (1 episode)
2009
The Goode Family
(1 episode)
2009
The Bonnie Hunt Show
Self · (1 episode)
2008
Buffy the Animated Series
Willow Rosenberg · (1 episode)
2008
Farce of the Penguins
Hottie Penguin (voice)
2006
The Megan Mullally Show
Self - Guest · (1 episode)
2006
I Love the '70s: Volume 2
Self · (2 episodes)
2006
Date Movie
Julia Jones
2006
The Reichen Show
Self · (1 episode)
2005
How I Met Your Mother
Lily Aldrin · (208 episodes)
2005
Dancing with the Stars
Self - Contestant · (11 episodes)
2005
American Dad!
Lexie (voice) · (1 episode)
2005
American Dad!
Ugly Stepsister #2 (voice) · (1 episode)
2005
American Dad!
Chelsea (voice) · (1 episode)
2005
Veronica Mars
Trina Echolls · (3 episodes)
2004
American Pie: Revealed
Self
2004
The Ellen DeGeneres Show
Self · (2 episodes)
2003
American Wedding
Michelle Flaherty
2003
Pepsi Smash
Self - Host · (1 episode)
2003
Beyond the City Limits
Lexi
2001
American Pie 2
Michelle Flaherty
2001
Playboy Mansion Parties Uncensored
Self
2001
Boys and Girls
Betty
2000
100 Deeds for Eddie McDowd
(2 episodes)
1999
Angel
Willow Rosenberg · (3 episodes)
1999
Hayley Wagner, Star
Jenna Jakes
1999
Teen Choice Awards
Self - Presenter · (1 episode)
1999
The Late Late Show with Craig Kilborn
Self - Guest · (1 episode)
1999
The Wild Thornberrys
Gerda (voice) · (1 episode)
1998
That '70s Show
Suzy Simpson · (2 episodes)
1998
Dead Man on Campus
Lucy
1998
Buffy the Vampire Slayer
Willow Rosenberg · (144 episodes)
1997
King of the Hill
Stacey Gibson (voice) · (1 episode)
1997
For My Daughter's Honor
Kelly
1996
The Daily Show
Self · (2 episodes)
1996
A Case for Life
Iris
1996
The Stranger Beside Me
Dana
1995
Touched by an Angel
Cassie Peters · (1 episode)
1994
Late Night with Conan O'Brien
Self - Guest · (2 episodes)
1993
MTV Movie & TV Awards
Self - Presenter · (1 episode)
1992
The Tonight Show with Jay Leno
(1 episode)
1992
The Torkelsons
Samantha · (2 episodes)
1991
Rugrats
Cynthia P.I. (voice) · (1 episode)
1991
Switched at Birth
Gina Twigg, Age 13–16
1991
Switched at Birth
Gina Twigg, Age 13-16
1991
The Simpsons
Melody Juniper (voice) · (1 episode)
1989
Free Spirit
Jessie Harper · (14 episodes)
1989
My Stepmother Is an Alien
Jessie Mills
1988
Roseanne
(1 episode)
1988
Impure Thoughts
Patty Stubbs (as Allison Hannigan)
1986
Entertainment Tonight
Self · (1 episode)
1981