ò-N-Acetylgalactosaminidase (, N-acetyl-ò-galactosaminidase, N-acetyl-ò-<small>D</small>-galactosaminidase, ò-acetylgalactosaminidase, ò-<small>D</small>-N-acetylgalactosaminidase, N-acetylgalactosaminidase) is an enzyme with systematic name ò-N-acetyl-<small>D</small>-galactosaminide N-acetylgalactosaminohydrolase. It catalyses the hydrolysis of terminal non-reducing N-acetyl-<small>D</small>-galactosamine residues in N-acetyl-ò-<small>D</small>-galactosaminides.