Peter Szymon Serafinowicz (/ˌsɛrəˈfɪnoʊwɪtʃ/SERR-ə-FIN-oh-witch; Polish: [sɛrafʲiˈnɔvʲit͡ʂ]; born 10 July 1972) is a British actor, comedian and writer. He is known for his roles as Pete in Shaun of the Dead (2004), Garthan Saal in Guardians of the Galaxy (2014), the voice of Big Daddy in Sing (2016) and Sing 2 (2021), The Tick in The Tick(2016), The Sommelier in John Wick: Chapter 2 (2017) and Spitelout in the live-action remake How to Train Your Dragon (2025).

On television, Serafinowicz created and starred in the comedy shows Look Around You (2002–2005) and The Peter Serafinowicz Show (2007–2008). He also voiced characters and worked as a creative consultant on South Park (2006–2015), portrayed Edgar Covington in Parks and Recreation (2013–2015), voiced the Fisher King in Doctor Who (2015), and starred as the title character in the live-action adaptation series The Tick (2016–2019). His other television work includes voicing characters in animated series such as Archer, Bob's Burgers, Rick and Morty, The Simpsons, American Dad!, and the second season of What If...?, reprising his live-action role as Garthan Saal.