Portman Square is a public garden located in the Marylebone area of London, England. It is surrounded by elegant Georgian buildings and offers a peaceful green space for residents and visitors. The square is named after the Portman family, who were influential landowners in the area during the 18th century. The garden features well-maintained lawns, flower beds, and benches, making it a popular spot for relaxation and leisure activities. It is also close to various attractions, including the Marylebone High Street and the Baker Street area, known for its connection to Sherlock Holmes.