Frank Gusenberg was an American contract killer and a victim of the Saint Valentine's Day massacre in Chicago, Illinois.

The Saint Valentine's Day Massacre was the murder of seven members and associates of Chicago's North Side Gang on Saint Valentine's Day 1929. The men were gathered at a Lincoln Park, Chicago garage on the morning of February 14, 1929. They were lined up against a wall and shot by four unknown assailants, two of whom were disguised as police officers.