Lee Chaejin is a South Korean voice actor. He began his career in the performing arts as a theater actor in 1983. In 1987, he joined the 9th cohort of voice actors at the Educational Broadcasting System, transitioning into voice acting professionally. He is known for his thick and humorous vocal quality, which has seen him frequently cast in roles for middle-aged and elderly characters.

Among his notable voice roles in animation is the character Drago, an elderly and knowledgeable dragon, in the Korean-language version of the series Petite Princess Yucie. In the same series, he also provided the voice for the King of Heavenly Realm. Another of his widely recognized roles is that of Mr. Krabs in the EBS broadcast of the popular animated series SpongeBob SquarePants. His work also extends to other animated shows such as Angelina Ballerina, where he voiced the character of Dad, and to video games, including a role in Tales Runner.

Throughout his career, Lee Chaejin has been involved in a variety of projects beyond animation, including dubbing for special effects films, radio dramas, and cultural event hosting. Until the end of 2017, he served as the head of the EBS Voice Actor's Theatre Society, marking a significant leadership role within his professional community.