Isaj Dratwer (born January 1, 1905, Warsaw, died 1985) was a Polish Jewish bacteriologist and esperantist. In the Esperanto movement, Dratwer was a strong advocate, President of the Esperanto Academy, and committee secretary in 1927 and 1931. He often published articles or letters in the Heroldo de Esperanto (Esperanto Herald), Pola Esperantisto (Polish Esperantist) and others. He also translated Russian-language novels by Romanov in 1932.