Alexandru Slătineanu (January 5, 1873 – November 27, 1939) was a Romanian bacteriologist, civil servant, and art collector. From an aristocratic and intellectual background, he embraced socialism while studying in Paris in the 1890s, becoming a lifelong associate of the socialist physician Ioan Cantacuzino. Slătineanu served his country in the Second Balkan War and World War I, creating a medical infrastructure designed to combat cholera and typhus, and improving immunology research. His laboratory continued to set the national standard in the field of bacteriology during the interwar years.