This study focuses on the preservation of the Minamanwa language, an indigenous language spoken by the Mamanwa tribe in the Philippines. Employing a qualitative ethnographic research design, data were collected through observations and interviews with adult members of the Mamanwa community in Barangay Jubgan, Surigao del Norte. The findings reveal 404 Minamanwa words, with a 10.2% similarity to the Visayan language in spelling and pronunciation. Additionally, a mini-dictionary was developed as a lexical reference for the Minamanwa language in English. The study concludes that the Minamanwa language has been influenced by the Visayan language due to daily interactions, and it holds potential for use within schools, particularly in the MTB-MLE program. Recommendations include incorporating the Minamanwa dictionary into language instruction, implementing language programs to preserve indigenous languages, and conducting further research on ethnolinguistic languages in the Philippines. This study contributes to the preservation and recognition of indigenous languages, fostering cultural continuity and pride among Filipino communities.