Alfred Kast (25 July 1856 in Illenau, near Achern – 7 January 1903) was a German internist.
He studied medicine at the Universities of Heidelberg, Freiburg and Leipzig, earning his doctorate in 1879.
He served as an assistant to Wilhelm Heinrich Erb (1840–1921) in Heidelberg, Julius Friedrich Cohnheim (1839–1884) in Leipzig, and from 1881 was a clinical assistant to Christian Bäumler (1836–1933) at Freiburg.
Kast was instrumental in introducing phenacetin and the sulphonal group of drugs into medicine.
[1] With surgeon Theodor Rumpel (1862–1923), he was co-author of an illustrated patho-anatomical atlas called: Pathologisch-anatomische Tafeln nach frischen Präparaten mit erläuterndem anatomisch-klinischem Text (Patho-anatomical panels for fresh preparations with explanatory anatomical-clinical text).