Lothar is a German name which means "famous warrior," and is cognate with the French name "Lothair" or "Clotaire." Famous Lothars include:
- East German statesman Lothar Bolz (1903-1986)
- Lothar, the gigantic Nazi henchman played by Austrian actor Tiny Ron in the 1991 film The Rocketeer.
- Lothar of the Hill People, an oafish yet surprisingly articulate barbarian played by commedian Mike Myers in a recurring Saturday Night Live sketch.
- Holy Roman Emperors Lothar I and Lothar II.
- Former German footballer and current head coach of the Hungarian national team Lothar Matthäus.
- German mathemetician Lothar Collatz, proposer of the famous Collatz conjecture, which remains unsolved.
- World War I flying ace Lothar von Richthofen, the younger brother of the legendary "Red Baron" Manfred von Richthofen.
- German historian Lothar Machtan, who famously proposed that Hiter was gay in his book The Hidden Hitler.
- Lothar, a cyclone which struck central Europe on December 26, 1999, heavily damaging parts of Germany, France, and Switzerland.
- Lothar, the theremin used by psychedelic 1960s rock band Lothar and the Hand People.