The enzyme acetylxylan esterase () catalyzes the deacetylation of xylans and xylo-oligosaccharides.
This enzyme belongs to the family of hydrolases, specifically those acting on carboxylic ester bonds. The systematic name is acetylxylan esterase.
As of late 2007, 4 structures have been solved for this class of enzymes, with PDB accession codes , , , and .