Edmund Faustyn Biernacki (b. December 19, 1866 in Opoczno - December 29, 1911 in Lwów) was a Polish physician.

Biernacki was the first one to note a relationship between the rate of disappearance of the red corpuscles in a human blood sample and the general condition of the organism. This method, known as the Biernacki Reaction, is universally practised in all laboratories in the world.