Koprowski received many honorary degrees, academic honors, and national decorations, including the Order of the Lion from the King of Belgium, the French Order of Merit for Research and Invention, a Fulbright Scholarship, and appointment as Alexander von Humboldt Professor at the Max Planck Institute for Biochemistry in Munich. In 1989 he received the San Marino Award for Medicine and the Nicolaus Copernicus Medal of the Polish Academy of Sciences in Warsaw.