Background: The importance of evidence-informed health policymaking is widely recognized. However, many low- and middle-income countries lack evidence-informed mental health policies due to insufficient data, stigma or lack of resources. Various policies address adolescent mental health in India, but published knowledge on their evidence-informed nature is limited. In this paper, we report results of our analysis of the role of evidence in adolescent mental health policymaking in India. Methods: This paper reports findings from the document analysis of key policy documentation (n = 10) and in-depth interviews with policy actors including policymakers, researchers, practitioners and intermediaries (n = 13). Framework analysis was used, informed by the components of a conceptual framework adapted from the literature: actors, policy and evidence processes, nature of evidence itself and contextual influences. Results: Results show that adolescent mental health policies in India were generally evidence-informed, with more key evidence becoming generally available from 2010 onwards. Both formal and informal evidence informed mental health policies, particularly agenda-setting and policy development. Mental health policymaking in India is deemed important yet relatively neglected due to competing policy priorities and structural barriers such as stigma. Use of evidence in mental health policymaking reflected differing values, interests, relative powers and ideologies of policy actors. Involvement of government officials in evidence generation often resulted in successful evidence uptake in policy decisions. Policy actors often favoured formal and quantitative evidence, with a tendency to accept global evidence that aligns with personal values. Conclusions: There is a need to ensure a balanced and complementary combination of formal and informal evidence for policy decisions. Evidence generation, dissemination and use for policy processes should recognize evidence preferences by key stakeholders, while prioritizing locally available evidence where possible. To help this, a balanced involvement of policy actors can ensure complementary perspectives in evidence production and policy agendas. This continued generation and promotion of evidence can also help reduce societal stigma around mental health and promote mental health as a key policy priority.