The Tribal Plurality and Cultural Inflexibility in Papua New Guinea (PNG) address a unique sense of socio-political structure indicating peculiarities of its own compared to other tribal nations. This distinctive mode of traditional tribal cultural phenomena got its prominence because of the existence of over eight hundred tribes with similar count of languages thereof in PNG. All different tribes and their diverse cultures tend to maintain their pride and distinctiveness without any compromise. That is how, this long enduring tribal plurality and cultural inflexibility influence day to day life of Papua New Guineans at large. This study would endeavor the effectiveness of the multiplicity of tribes and their rigid cultures against the waves of modern global expectations. Research under study would be dealt in using the ethnographic and anthropological methods facing the efficacy of Melanesian society and culture.