This paper presents the works of Dr. Harisingh Gour (1870-1949) in the theoretical framework of sustainable development; specifically, the United Nations Sustainable Development Goals (SDGs). Gour was a jurist, educationist, and social reformer in colonial and post-colonial India, whose legal reform, higher education, and gender equality work anticipated important social sustainability ideals. This study, based on a mixed-method approach comprising of historical research of the archival materials, such as parliamentary debates, his legal writings as well as institutional records and a qualitative survey of 40 respondents (academics, students, and activists) today, makes Gour a pioneer of reforms aligned with SDGs 4 (Quality Education), 5 (Gender Equality), and 16 (Peace, Justice, and Strong Institutions). The results demonstrate that there are high perceptions among the respondents that the view of equity, inclusion, and institutional integrity of Gour remains important in shaping sustainable practices in contemporary India. The paper comes up with the conclusion that Gour left a legacy that provides a native, historically-based approach to sustainable development, in opposition to Western-centric paradigms, and emphasizes the necessity to incorporate reformist traditions into the discourse of global sustainability.