Purpose: This study aims to help scholars comprehend the major research themes on sustainable development goals (SDGs) in higher education which researchers from various fields have explored and to propose several potential future research directions of the least researched SDG in higher education to support scholars in making up the gap in the field. Design/methodology/approach: The authors adopted a bibliometric analysis method to review the extant literature from the Web of Science on SDGs in higher education from 2015 to 2023 and took a closer examination of the most researched SDGs discussed by scholars. This study specifically concentrated on studies that explicitly mentioned the term "Sustainable Development Goal" (or "SDG") and applied VOSviewer to cluster common keywords of the most researched SDGs and explored related themes. Also, this study provided several potential future research directions of least researched SDG in higher education. Findings: SDGs 3 and 4 were the most researched, and SDG 15 was the least researched. The three major themes of SDG 3 were "Adult Issues of Sustainability," "South Africa Issues of Sustainability," and "Relationship between SDG 3 and SDG 4." The three major themes of SDG 4 were "the Role of Universities in Sustainability," "Sustainability during COVID-19," and "Challenges of Implementation." Originality/value: This study provided several potential future research directions of the least researched SDG in higher education to support scholars to make up the gap in the field. Also, this study pointed out some pedagogical strategies and competencies needed to aid higher education institutions in achieving the 17 SDGs.