Sustainable Development Goal (SDG) Target 4.b calls to "substantially expand globally the number of scholarships" for enrollment in overseas higher education between 2015 and 2020. To advance knowledge on international scholarships and sustainability, this chapter examines notions of sustainability in literature related to international scholarships for students in the Global South. Based on an exploratory review of literature, ways that sponsored international student mobility -- programs, students, graduates, and networks -- maintain and sustain systems and outcomes are explored. Findings are presented through four frames: (a) programmatic sustainability, (b) organizational development, (c) national sustainable development, and (d) international and global actions. Challenges to sustainability, such as poor coordination between degrees earned and local market conditions, are also discussed. In addition, the findings point to several prominent ways that scholarships could contribute to sustainability that are mostly absent from the literature: transformative education for sustainable development, and international education for environmental sustainability. The chapter closes with a vision of alumni networks -- both within and among programs -- to work together to transform societies and tackle the most pernicious international challenges of our time. [This chapter was published in: "Annual Review of Comparative and International Education 2020," International Perspectives on Education and Society, Vol. 40, Emerald Publishing Limited, 2021, pp. 257-277.]