Felix Arvid Ulf Kjellberg (born 24 October 1989), known online as PewDiePie, is an England-based Swedish YouTuber, comedian, gamer, and philanthropist, known primarily for his Let's Play videos and comedic formatted shows. After registering his eponymous YouTube channel in 2010, he primarily posted Let's Play videos of horror and action video games. His channel experienced substantial growth in popularity over the next two years, and he reached 1 million subscribers in July 2012. Over time, his style of content diversified to include vlogs, comedy shorts, formatted shows and music videos.

He became the most-subscribed YouTuber on 15 August 2013 and firmly held the title until early 2019, when he publicly vied for it with an Indian record label, T-Series. The latter established a significant lead in April that year, although his channel remains as the second-most-subscribed on the platform, having received over 106 million subscribers, as of August 2020. From December 2014 to February 2017, he had the most-viewed channel on YouTube. As of May 2020, his channel has received over 25 billion views, ranking as the 16th-most-viewed channel on the platform.