Xylan 1,4-ò-xylosidase (, xylobiase, ò-xylosidase, exo-1,4-ò-xylosidase, ò-<small>D</small>-xylopyranosidase, exo-1,4-xylosidase, exo-1,4-ò-<small>D</small>-xylosidase, 1,4-ò-<small>D</small>-xylan xylohydrolase) is an enzyme with systematic name 4-ò-<small>D</small>-xylan xylohydrolase. This enzyme catalyses the following chemical reaction
This enzyme also hydrolyses xylobiose.