A study about the diversity of fruit-feeding Nymphalidae butterflies had been carried out in Baruzo forest and Onolari forest on Nias Island. Sampling was conducted during three periods from August 2014 to April 2015), with a total of trapping as many as 340 trap days in the understorey and canopy within the forest using Cylindrical gauze traps. A total of 276 individual butterflies belonging to 18 species in four subfamilies and 12 genera was captured during the sampling periods in Baruzo forest and Onolari forest, with an Index of Diversity ( 1.92. Index of Evenness ( ) of fruit-feeding Nymphalidae butterfly obtained from this study was 0.66. Meanwhile the butterflies in Baruzo forest and Onolari forest have a high similarity in species, with Sorensen Index of Similarity (QS) =71%. Subfamily Satyrinae in the species Melanitis leda has the highest value of Abundance, Relative Abundance, and Frequency of Attendance.