Simon R. Green (born 1955) is a British fantasy and science fiction author known for fast-paced, character-driven adventure novels that often blend humor, dark fantasy, and urban fantasy elements. He is especially known for writing long-running series with strong cult followings.

Simon R. Green is regarded as a reliable and imaginative storyteller whose long-running series have earned a dedicated readership. While not heavily award-focused, his influence comes from his productivity and his role in shaping modern adventure fantasy and urban fantasy series fiction.