Aleksandr Ilyich Akhiezer (Ukrainian : Олекса́ндр Іллі́ч Ахіє́зер, Russian : Алекса́ндр Ильи́ч Ахие́зер ; October 18, 1911 – May 4, 2000) was a Soviet and Ukrainian theoretical physicist, known for contributions to numerous branches of theoretical physics, including quantum electrodynamics, nuclear physics, solid state physics, quantum field theory, and the theory of plasma. He was the brother of the mathematician Naum Akhiezer.