Dr. Brain (Korean: Dr. 브레인; RR: Dr. Beurein) is a 2021 South Korean web series created by Kim Jee-woon. The sci-fi thriller is based on the Korean webtoon of the same name by Hongjacga. Lee Sun-kyun stars in the lead role as a brain scientist trying to solve the mysterious death of his family by hacking into the brains of the deceased. The series is the first Korean-language show produced for Apple TV+. It debuted on November 4, 2021, to accompany the streaming service's launch in South Korea.

On January 27, 2022, multiple official sources stated that the series would have a second season.