The enzyme 1,3-ñ-L-fucosidase () catalyzes the hydrolytic cleavage of the 1,3-linkages between ñ-<small>L</small>-fucose and N-acetylglucosamine residues in glycoproteins.
It belongs to the family of hydrolases, specifically those glycosidases that hydrolyse O- and S-glycosyl compounds. The systematic name of this enzyme class is 3-ñ-<small>L</small>-fucosyl-N-acetylglucosaminyl-glycoprotein fucohydrolase. This enzyme is also called almond emulsin fucosidase I. It participates in the degradation of glycan structures.