Lasswell or Laswell is a surname. Notable people with the surname include:
Alva Lasswell (1905–1988), American Marine Corps officer who decoded the message that led to the death of Yamamoto Bill Laswell (born 1955), American bassist, producer and record label owner Butch Laswell (1958–1996), American stunt performer Fred Lasswell (1916–2001), American cartoonist Greg Laswell (born 1974), American musician, recording engineer, and producer Harold Lasswell (1902–1978), American political scientist and communications theorist Mary Lasswell (1905–1994), American author Shirley Slesinger Lasswell (1923–2007), American brand marketing pioneer