The increasing commercialization of mass media content has generated sustained scholarly concern regarding its implications for journalistic objectivity and democratic communication. This paper examined the relationship between media content commercialisation and the paradox of objectivity within the Nigerian media environment. Specifically, the study explored the concept of mass media content commercialisation, interrogated the paradox of objectivity in journalism, and analysed the implications of commercialisationfor journalistic objectivity in Nigeria. The paper adopted a qualitative approach based on extensive review and critical analysis of relevant scholarly literature and contemporary media practices. The discussion was anchored on Social Responsibility Theory and Political Economy Theory, which respectively explain journalism's ethical obligations and the structural economic forces influencing media content. The paper found that although commercialisation has become indispensable for the financial sustainability of media organisations, it increasingly shapes editorial decisions through dependence on advertising, political sponsorship, ownership influence, and market competition. These pressures encourage practices such as sponsored news, advertorials, brown envelope journalism and sensational reporting, thereby weakening editorial independence, reducing public trust and undermining democratic accountability. The researchers conclude that the paradox of objectivity arises from the persistent tension between journalism's public service obligation and the commercial realities of contemporary media practice. It recommends stronger ethical enforcement, improved journalists' welfare, clearer separation between editorial and commercial operations, greater investment in public-interest journalism and enhanced media literacy as essential measures for preserving journalistic objectivity within Nigeria's evolving media landscape.