Erik Selvig is a fictional character portrayed by Stellan Skarsgård in Marvel Cinematic Universe films Thor (2011), The Avengers (2012), Thor: The Dark World (2013), Avengers: Age of Ultron (2015), and Thor: Love and Thunder (2022) as an astrophysicist who becomes involved with the Asgardian Thor and the government organization S.H.I.E.L.D. To tie into these appearances, the character is seen in several MCU tie-in comics. The character also appears in other media, including non-MCU comics published by Marvel Comics. He was also the main protagonist of the 2018 tie-in prose novel The Cosmic Quest Volume Two: Aftermath.

Stellan John Skarsgård is a Swedish actor. He is known for his collaborations with director Lars von Trier, appearing in Breaking the Waves (1996), Dancer in the Dark (2000), Dogville (2003), Melancholia (2011), and Nymphomaniac (2013). Skarsgård's English-speaking film roles include The Unbearable Lightness of Being (1988), The Hunt for Red October (1990), Good Will Hunting (1997), Ronin (1998), and King Arthur (2004).