{{Infobox person
| name        = Haylie Duff
| image       = Haylie Duff by David Shankbone.jpg
| imagesize   =  
| birth_date  = 
| birth_place = Houston, Texas, United States
| birth_name  = Haylie Katherine Duff
| death_date  =
| death_place =
| partner     = Matt Rosenberg (2012-present)
| children    = Daughters
| relatives   = Hilary Duff (sister)
| height      =
| homepage    =
| known_for   = Acting roles:Sandy Jameson -7th HeavenAva Marchetta -Material GirlsSummer Wheatley -Napoleon Dynamite
}}
Haylie Katherine Duff (born February 19, 1985) is an American actress and singer. She is best known for her supporting role on the television series 7th Heaven. She is the sister of Hilary Duff.

Duff was born in Houston, Texas. Her mother, Susan Duff, is a producer. Robert Erhard Duff, Haylie's father, lives at the family home in Houston. Haylie is two and a half years older than her sister.

 Family 
Hilary Duff is her younger sister. 

 Discography 
Duff wrote or co-wrote several songs on two of her sister Hilary's albums, Metamorphosis (2003), Hilary Duff (2004) and the song, "Gypsy Woman", on Hilary's 4th album, Dignity. She has also done many songs for different soundtracks with her sister. 

 Soundtracks 
 2003 "Girl In The Band" — The Lizzie McGuire Movie soundtrack
 2004 "Sweetest Pain" — Raising Helen soundtrack
 2004 "A Whatever Life" — Stuck In The Suburbs soundtrack
 2004 "One In This World" — A Cinderella Story soundtrack
 2004 "Our Lips Are Sealed" (with Hilary Duff) — A Cinderella Story soundtrack
 2005 "Babysitting Is A Bum Deal" (duet with Stewie Griffin) — Family Guy: Live in Vegas soundtrack
 2006 "Material Girl" (with Hilary Duff) — Material Girls soundtrack & Girl Next CD
 2008 "Blow My Mind" — Drop Dead Gorgeous soundtrack & Girl Next CD

 Other songs 
 "Same Old Christmas" (with Hilary Duff)
 "The Siamese Cat Song" (with Hilary Duff)
 "The Siamese Cat Song" [Cat-Scratch Remix] (with Hilary Duff)

 Filmography 
{| class="wikitable"
|- bgcolor="#CCCCCC" align="center"
!Year
!Film
!Role
!Notes
|-
|1998
|Addams Family Reunion
| Gina Adams 
|Direct to video
|-
|rowspan="1"|2000
|Dreams in the Attic
|Jessica
|
|-
|rowspan="1"|2001
|The Newman Shower
|Wendy
|
|-
|rowspan="1"|2003
|I Love Your Work
|Frat Brat Girlfriend
|
|-
|rowspan=2|2004
|Napoleon Dynamite
|Summer Wheatly
|
|-
|In Search of Santa
|Lucinda
|Direct-to-video release
|-
|2005
|Dishdogz
|Cassidy
|
|-
||2006
|Material Girls
| Ava Marchetta
| 
|-
|rowspan="3"|2007
|Nightmare (TV)
|Molly Duggan
|Made for TV
|-
|My Sexiest Year
| Debbie
|
|-
|I Remember
|Jenni Ryan
|
|-
| rowspan=2| 2008
| Legacy
| Lana Stevens 
|
|-
| Deep Cove 
|Jenna 
|
|-
| rowspan=5 | 2009 
| Love Takes Wing 
| Annie Nelson 
| Love Comes Softly series
|-
| Love Finds a Home 
| Annie Nelson 
| Love Comes Softly series
|-
| Foodfight! 
| Sweet Cakes 
| Voice
|-
| A Nanny's Secret 
| Claudia 
|
|-
| Tug 
| Jill 
|
|}

TV appearances 
 2005-2007: 7th Heaven as Sandy Jameson
 2002-2003: Lizzie McGuire as Amy

Guest appearances
 1999: The Amanda Show as Jealous Girl in Crowd
 2000: Chicago Hope as Jenny
 2001: Boston Public as Sylvia (two appearances)
 2003: American Dreams as Shangri-Las (with Hilary)
 2003: Third Watch as Young Faith
 2004: That's So Raven as Katina
 2004: One on One as Mandy
 2005: Complete Savages as Jessica
 2005: Joan of Arcadia as Stevie Marx (three appearances)
 2007: My Sexiest Year as Debbie
 2008: Backwoods as Lee
 2008: Doesn't Texas Ever End as Mercedez
 2009: Slightly Single in L.A. as Jill

Other websites 
Haylie Duff cast bio on The CW

1985 births
Living people
Actors from Houston, Texas
American movie actors
American pop singers
American television actors
Singers from Houston, Texas