Background: ␣-L-Arabinofuranosidases hydrolyze arabinofuranosyl side chains from xylans. Results: The first crystal structures of two fungal ␣-L-arabinofuranosidases representing two distinct subfamilies from the glycoside hydrolase GH62 family are presented. The examination of these unveils specificity determinants. Conclusion:The structures of complexes with arabinose and cellotriose provide preliminary insight into substrate recognition and catalysis. Significance: This work provides the first structural description members of the GH62 family.