St Mawr is a short novel (or novella) written by D. H. Lawrence. It was first published in 1925. The heroine of the story, Lou Witt, abandons her sterile marriage and a brittle, cynical post-First World War England. Her sense of alienation is associated with her encounter with a high-spirited stallion, the eponymous St Mawr. She eventually settles in a remote ranch set high in the mountains of New Mexico, near Taos.