Uilyam Jozef 'Billi' Boldvin (1963-yil 21-fevralda tug'ilgan) amerikalik aktyor, produser va yozuvchi bo'lib, "Flatliners" (1990), "Backdraft" (1991), "Sliver" (1993), "Fair Game" (1995), "Virus" (1999), "Double Bang" (2001) kabi filmlardagi bosh rollari bilan tanilgan. U "Danny Phantom" (2004–2007) multfilmida Johnny 13 sifatida, "Art Heist" (2004), "The Squid and the Whale" (2005) filmlarida, ABC drama seriyasida "Dirty Sexy Money" (2007–2009) da senator Patrik Darling sifatida, "Justice League: Crisis on Two Earths" (2010) filmida va "Gossip Girl" serialida Uilyam van der Vudsen, shuningdek "Parenthood" serialida Gordon Flint sifatida muntazam mehmon bo'lgan. U "The Craigslist Killer" nomli Lifetime Original filmida bosh tergovchi Brian Albert sifatida ham rol o'ynagan. U aktyorlar Alek Boldvin, Stiven Boldvin va Daniel Boldvinning ukasi. U qo'shiqchi Chynna Phillips (Wilson Phillips) bilan turmush qurgan va ularning 3 farzandi bor.
