Waldemar Mordechai Wolff Haffkine CIE (Ukrainian: Володимир Мордехай-Вольф Хавкін; Russian: Мордехай-Вольф Хавкин; 15 March 1860 Odessa – 26 October 1930 Lausanne) was a bacteriologist born in Odessa, Russian Empire who later became a French citizen. He emigrated to France and worked at the Pasteur Institute in Paris, where he developed a cholera vaccine that he tried out successfully in India. He is recognized as the first microbiologist who developed and used vaccines against cholera and bubonic plague.