The 37th Mandala is a horror novel written by Marc Laidlaw and published in 1996. The story centres on cynical New Age writer Derek Crowe, who uses an ancient mystical text containing a series of Mandalas as the basis for his latest work, The Mandala Rites. Crowe privately believes that the subjects he writes about are superstitious nonsense but soon realises his new book will unleash a lurking interdimensional horror endangering both his witless fans and the world.