The internationalization of higher education has expanded the role of second language learning beyond its purely communicative function, positioning it as a potential capacity in the development of research leadership among university students. Despite extensive research on the cognitive and communicative outcomes of bilingualism, its multidimensional role in shaping research leadership has not been systematically conceptualized. To address this gap, the present study adopts a Systematic Conceptual Review approach and synthesizes 28 peer-reviewed studies published between 2000 and September 2025.

The findings indicate that second language learning contributes to research leadership development through five interrelated dimensions: cognitive reconfiguration, discursive empowerment, scientific identity transformation, ethical internalization, and intercultural competence enhancement. These dimensions do not operate linearly; rather, they interact dynamically and synergistically, shaping a multidimensional architecture of research leadership.

Accordingly, a conceptual model is proposed in which second language learning is understood not as a direct causal factor but as a structural enabler of cognitive, communicative, and network-based capacities underlying research leadership. The findings offer implications for higher education policymakers, curriculum planners, and graduate program designers seeking to strengthen the foundations of research leadership development within globally connected academic contexts.