Mark Alan Ruffalo (/ˈrʌfəloʊ/; born November 22, 1967) is an American actor. He began acting in the late 1980s and gained recognition for his work in Kenneth Lonergan's play This Is Our Youth (1996) and the drama film You Can Count on Me (2000). He went on to star in the romantic comedies 13 Going on 30 (2004) and Just like Heaven (2005) and the thrillers In the Cut (2003), Zodiac (2007), and Shutter Island(2010). He received a Tony Award nomination for his supporting role in the Broadway revival of Awake and Sing! in 2006. Ruffalo has gained international recognition for playing Bruce Banner / The Hulk since 2012 in the Marvel Cinematic Universe superhero franchise.

Ruffalo earned a record-tying four nominations for the Academy Award for Best Supporting Actor for playing a sperm donor in the comedy-drama The Kids Are All Right (2010), Dave Schultz in the biopic Foxcatcher (2014), Michael Rezendes in the drama Spotlight (2015), and a debauched lawyer in the comic fantasy Poor Things (2023). He won a Screen Actors Guild Award for Best Actor for playing a gay activist in the television drama film The Normal Heart (2015) and a Primetime Emmy Award for Outstanding Lead Actor for his dual role as identical twins in the miniseries I Know This Much Is True (2020).

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