Abbess Fenna was a female squirrel leader of Redwall Abbey. She was friends with Springald and Horty.
Along with her comrades, as well as Bragoon and Sarobando, Fenna journeyed to Loamhedge Abbey as a youth to find a cure for Martha Braebuck's inability to walk. During the trip, she experienced dehydration, but recovered after Horty discovered a brook. She also found an admirer in Wuddle, who doted on her the entire time the travelers were in the company of the Guoraf. Fenna also participated in the battle against Kharanjul's Horde, but was forced to flee the fight by Bragoon and Sarobando, who held the vermin off while the trio of young ones escaped.
She was appointed Abbess by Abbot Carrul after he received a dream from Martin the Warrior. Martin told Carrul that whoever carried his sword back to Redwall would be its new leader. Initially, Horty carried the sword, but he injured himself while showing off to the Guoraf shrews. As a result, Fenna took over sword carrying duties, an action which caused great relief among the Abbey dwellers, who were concerned about Horty's leadership abilities.
Not to be confused with Fenno and Fenn Bluepaw.