Emil Thomas Kaiser (February 15, 1938 – July 18, 1988) was a Hungarian-born American biochemist.Kaiser was most notable for his research of enzyme modification. He also was noted for developing new types of catalysts and for a more active form of a peptide hormone. Chicago Tribune said that Kaiser "developed a whole new approach to synthetic chemistry". The Protein Society has established an award in Kaiser's name - The Emil Thomas Kaiser Award which "recognizes a significant contribution in applying chemistry to the study of proteins".