Arie Andries Kruithof (1909, Zeist (NL) – 1993, Son en Breugel (NL)) was a Dutch professor of applied physics at Eindhoven University of Technology (Netherlands). Kruithof studied physics at Utrecht University, where he obtained a doctor’s degree from Leonard Ornstein in 1934. At Philips, he did research on lighting systems, especially gas-discharge lamps. Later he was appointed professor of applied physics at Eindhoven University of Technology, leading the Atomic Physics group, mainly researching gas discharges and plasmas.