Daniel Kastler (French: [kastlɛʁ]; 4 March 1926, Bandol – 8 July 2015) was a French theoretical physicist, working at University of Aix-Marseille (Luminy) on non-commutative geometry.
Kastler is best known for his 1964 article with Rudolf Haag on algebraic quantum field theory (the Haag–Kastler axioms), which is one of the most cited papers in mathematical physics.
He is the son of Physics Nobel Prize laureate Alfred Kastler.
He died on Saturday, July 8, 2015 in Bandol, France.