James Morelli (March 18, 1927 – November 26, 1949) was a gangster based in Chicago, Illinois, who was executed for participating alongside gangsters Thomas Daley and Lowell Fentress in the mass murder of three people. Several newspapers called the killings the "Mad Dog" murders. Although Morelli participated in three murders, he was only sentenced to death for the murder of one of the victims, 30-year-old Emil Schmeichel. Some reporters described Morelli's crime as "the worst Chicago mass killing since the Saint Valentine's Day massacre."