Robert Mullin Winn (September 11, 1888 - May 14, 1969) was an American historian and unofficial guide of Boston, Massachusetts. Born in Claremont, New Hampshire, Winn attended school in Claremont and graduated from Stevens High School in 1909. He continued his education at Springfield College and graduated in 1914. During World War I, he worked as secretary of the Young Men's Christian Association at Fort Revere in Boston, Massachusetts. After the war, Winn moved to Quincy, Massachusetts, and helped organize the Granite Trust Company's savings department. In 1929 - 1930, Winn was part of the group that organized the Massachusetts Bay Tercentenary. From the 1930s through the mid-1950s, Winn was Boston's 'official greeter - without portfolio'. He also helped set up Boston's Freedom Trail. He married Alice Seeber on June 5, 1915, with whom he had two daughters.