Dr. Austin Sloper is a fictional character from the novel "Washington Square," written by Henry James. He is a wealthy and successful physician living in New York City during the 19th century. Dr. Sloper is known for his intelligence and strong opinions, particularly regarding his daughter, Catherine Sloper. In the story, Dr. Sloper is protective of Catherine and skeptical of her romantic interests, especially towards Morris Townsend, a charming suitor. His character embodies themes of parental authority, social class, and the complexities of love and marriage in a changing society.