Joaquim Dos Santos is a Portuguese-American television director of animated cartoons, best known for his directing work on Justice League Unlimited, Avatar: The Last Airbender, and The Legend of Korra. He was a storyboard artist for Justice League before being promoted in the show's renamed third season. He then directed half of the JLU episodes alongside fellow DCAU director Dan Riba, including the final episode "Destroyer." He joined the team of Avatar: The Last Airbender in the middle of the show's second season as a storyboard artist and began directing episodes in the third season, including the last two parts of the four-part season finale.

He also directed the miniseries G.I. Joe: Resolute. After that project, he returned to Warner Bros. Animation, where he directed two DC Showcase short films: The Spectre (accompanying the direct-to-video film Justice League: Crisis on Two Earths) and Jonah Hex (on Batman: Under the Red Hood). He is currently working as an executive producer and co-showrunner of the animated series Voltron: Legendary Defender alongside Lauren Montgomery.

Some fans have nicknamed him "Dr. Draka" because of his mastery in staging fight scenes and action episodes.