Abaca bunchy top virus (ABTV) is a major constraint to abaca (Musa textilis Nee) production in the Philippines. As the disease is transmitted by the banana aphid, Pentalonia nigronervosa, effective vector management is critical for limiting virus transmission and disease spread. Although chemical insecticides are widely used, their prolonged application may lead to insecticide resistance, environmental contamination, and pest resurgence. This study evaluated indigenous fungi as potential biological control agents against the banana aphid. Field surveys were conducted in selected abaca-growing areas of Biliran, Leyte, and Southern Leyte, Philippines, where aphids were collected from symptomatic plants and examined for natural fungal infection. Fungal isolates recovered from infected aphid cadavers were identified using morphological and cultural characteristics and internal transcribed spacer rDNA sequence analysis. Molecular identification revealed a diverse assemblage of indigenous fungi, with Fusarium spp. being the predominant group recovered from aphid cadavers. Pathogenicity assays conducted under laboratory and screenhouse conditions demonstrated that all tested fungal isolates exhibited pathogenicity against the banana aphid, although their efficacy varied significantly between isolates. Among the indigenous isolates, Aspergillus nomiae and Fusarium proliferatum, showed the highest laboratory pathogenicity, each causing 86.67% mortality at 96 hours after treatment initiation, while Purpureocillium lilacinum caused 80.00% mortality. Under screenhouse conditions, P. lilacinum produced the highest corrected mortality among the indigenous isolates (36.61%) by Day 7, followed by Fusarium sp. (32.86%) and F. proliferatum (31.23%). These findings identified indigenous fungi, particularly A. nomiae, F. proliferatum, and P. lilacinum, as potential candidates for further evaluation as biological control agents against P. nigronervosa in selected provinces of Eastern Visayas, Philippines. However, further assessment of plant pathogenicity, biosafety, and effects on non-target organisms is necessary before these isolates can be considered for field application.