Abstract Language policies are fundamental in influencing educational outcomes, cultural identity, and the cohesion of society. This study critically examines the language policies of Nigeria and South Africa, focusing on the 2013 National Policy on Education and the 1996 Language in Education Policy, respectively, to assess their effectiveness in fostering multilingual education. Using a qualitative research approach and purposive sampling, thematic analysis was conducted with Latent Dirichlet Allocation (LDA) software, revealing that while these policies advocate for multilingualism, equity, and cultural preservation, their implementation remains inadequate due to resource constraints, insufficient teacher training, and the dominance of colonial languages. Unlike previous studies that focus on theoretical frameworks, this research highlights the urgent need for pragmatic, context-driven policy execution. The study recommends the establishment of specialized teacher training centers for multilingual instruction, the mandatory integration of local languages in STEM education, and the development of a policy framework that encourages public-private partnerships to fund indigenous language materials. Additionally, it advocates for legislative measures ensuring national examinations accommodate multilingual assessments, thereby reducing the hegemony of colonial languages. These targeted interventions will bridge the gap between policy and practice, ensuring that language policies in South Africa and Nigeria contribute meaningfully to inclusive and equitable education. By adopting these recommendations, both countries can enhance learning outcomes, promote cultural identity, and advance the realization of Sustainable Development Goal 4 (SDG 4).