Alexandru Nicolschi (born Boris Grünberg, his chosen surname was often rendered as Nikolski or Nicolski; Russian: Александр Сергеевич Никольский, Alexandr Sergeyevich Nikolsky; June 2, 1915–April 16, 1992) was a Romanian communist activist, Soviet agent and officer, and Securitate chief under the Communist regime. Active until the early 1960s, he was one of the most recognizable leaders of violent political repression.