Maria Lang
- Birthday: 1914-03-31
- Deathday: 1991-10-08
- Place of birth: Västerås, Sweden
- Also know as: Dagmar Lange
Maria Lang, born Dagmar Maria Lange, was a Swedish author and screenwriter of crime fiction. She was one of the first detective novelists in the Swedish language, and her books helped make the genre popular in Sweden.
