Keramidaza (EC3.5.1.23, acilsfingozinska deacilaza, glikosfingolipidna keramidna deacilaza) je enzim sa sistematskim imenom N-acilsfingozin amidohidrolaza.[1][2] Ovaj enzim katalizuje sledeću hemijsku reakciju
^Nilsson, A. (1969). „The presence of spingomyelin- and ceramide-cleaving enzymes in the small intestinal tract”. Biochim. Biophys. Acta. 176: 339—347. PMID5775951.
^Yavin, E. & Gatt, S. (1969). „Enzymatic hydrolysis of sphingolipids. 8. Further purification and properties of rat brain ceramidase”. Biochemistry. 8: 1692—1698. PMID5805303.