Semantic Error (Korean: 시맨틱 에러; RR: Simaentik Ereo) is a 2022 South Korean streaming television series based on a homonymous BL web novel by Jeo Soo-ri, starring Park Seo-ham and Park Jae-chan. It premiered on February 16, 2022, on Watcha. The series is the first BL to achieve a major success in South Korea. The series became a social phenomenon and introduced the BL genre to the mainstream South Korean audience, which resulted in a rising production of South Korean BL dramas and films. The series was included on Teen Vogue's best BL dramas of 2022 list.

The theatrical version of the series, Semantic Error: The Movie, was first screened at the 26th Bucheon International Fantastic Film Festival and commercially released in August 2022.