Ludwig Ahgren is an American live streamer, YouTuber, and podcaster, best known for popularizing the "subathon" format with a month-long live stream that landed him the Twitch subscriber record from April 2021 to February 2023.

Since then, Ahgren has founded the production companies Mogul Moves and Offbrand Productions, and frequently appears as a host on self-produced live events and game shows.