William Hall Macy, Jr. (d. 13 Mart 1950) ABD'li aktör, film yönetmeni, tiyatro oyuncusu, tiyatro eğitmeni ve tiyatro yönetmeni. Oscar Ödülü adaylığı olan Macy Emmy ve SAG ödülleri sahibidir.
Filmografi
• The Awakening Land (1978) – Will Beagle
• Foolin' Around (1980) – Bronski (W.H. Macy)
• Somewhere in Time - Eleştirmen
• Without a Trace (1983) – Gazeteci
• The Boy Who Loved Trolls (1984) – Kaplumbağa Socrates
• The Last Dragon (1985) – J.J.
• Kate & Allie (1986) – Carl
• House of Games (1987) – Çavuş Morgan
• Radio Days (1987) - Radyo sanatçısı
• The Murder of Mary Phagan (1988) – Randy
• Things Change (1988) – Billy Drake
• The Water Engine (1992) - Charles Lang
• Being Human (1993) – Boris
• Benny & Joon (1993) – Randy Burch
• Searching for Bobby Fischer (1993) – Tunafish Father
• ER (1994–1998) – Dr. David Morgenstern
• Dead on Sight (1994) – Steven Meeker
• The Client (1994) - Dr. Greenway
• Mr. Holland's Opus (1995) – Vice Principal Gene Wolters
• Fargo (1996) – Jerry Lundegaard
• Andersonville (1996) - Albay Chandler
• Down Periscope (1996) – Komutan Carl Knox (USS Orlando)
• Ghosts of Mississippi (1996) – Charlie Crisco
• Air Force One (1997) – Binbaşı Caldwell
• Boogie Nights (1997) – Küçük Bill
• Wag the Dog (1997) – CIA Ajanı Charles Young
• Pleasantville (1998) – George Parker
• Psycho (1998) – Milton Arbogast
• A Civil Action (1998) – James Gordon
• The Con (1998) – Bobby Sommerdinger
• Happy, Texas (1999) – Şerif Chappy Dent
• Mystery Men (1999) – The Shoveller
• Magnolia (1999) – Quiz Kid Donnie Smith
• State and Main (2000) – Walt Price
• Panic (2000) Alex
• Jurassic Park III (2001) – Paul Kirby
• Focus (2001) – Lawrence 'Larry' Newman
• Door to Door (2002) – Bill Porter
• It's A Very Merry Muppet Christmas Movie (2002) - Glenn
• The Cooler (2003) – Bernie Lootz
• Easy Riders, Raging Bulls (2003) – anlatıcı (belgesel)
• Seabiscuit (2003) – Tick Tock McGlaughlin
• Reversible Errors (2004) - Arthur Raven
• Cellular (2004) – Mooney
• In Enemy Hands (2004) - Gemi kaptanı Nathan Travers
• Spartan (2004) – Stoddard
• The Wool Cap (2005) – Gigot
• Sahara (2005) – Amiral James Sandecker
• Edmond (2005) – Edmond Burke
• Thank You for Smoking (2005) – Senatör Ortolan K. Finistirre
• The Magic Roundabout (2006) – Brian the snail
• Nightmares and Dreamscapes: “Umney's Last Case” (2006-07-19) – Sam, Unney
• Bobby (2006) – Paul
• Curious George (2006) – anlatıcı (1. sezon)
• Everyone's Hero (2006) – Lefty Maginnis (ses)
• Inland Empire (2006) – Anons yapan
• Wild Hogs (2007) – Dudley Frank
• He Was a Quiet Man (2007) - Gene Shelby
• The Deal (2008) - Charlie Berns
• Bart Got A Room (2008) - Ernie Stein
• The Tale of Despereaux (2008) (yapım aşamasında) (ses) - Lester
• The Lonely Maiden (2008) (plan aşamasında) - George
• Shameless (2010)