Jonathan R. Bass (November 25, 1830 - September 13, 1892) was an American sideshow attraction. His stage name was The Ossified Man. He was born in New York State. Rheumatism led to the ossification of his joints, tendons, and muscles in his teen years. His sideshow career began in 1887 at Niagara Falls. He toured the United States. He died in New York City in 1892. 