This study explores solo librarians' perceptions of their role in sustainability and assesses their opinions, familiarity, and interest concerning the topic. It also examines their attitudes toward promoting the Sustainable Development Goals (SDGs) and evaluates professional perspectives on the level of management support for such initiatives, identifying factors that influence engagement and collaboration. Data was gathered from 180 solo librarians across Kerala, Tamil Nadu, and Karnataka. The findings show librarians recognize their crucial function in advancing sustainability through inclusivity, lifelong learning, and open access. Those with higher qualifications and experience were significantly more active. While most solo librarians do promote sustainability activities, the research highlights a pressing need: varied management support and reliance on non-professional staff undercut their efforts. However, varied support from management and frequent reliance on non-professional staff highlight the need for greater institutional support and formal recognition to encourage librarians to undertake sustainability-related initiatives.
 
