Mainstreaming climate adaptation objectives into existing policies and practices, as opposed to developing new or dedicated adaptation policies has several advantages for achieving sustainable change. Based on in-depth analysis of 31 strategic policy documents together with 34 stakeholder interviews, this article addresses the following questions across six sectors as follows: (i) to what extent has climate adaptation been mainstreamed into sectoral policies; (ii) what are the constraints impeding adaptation mainstreaming; (iii) what steps are needed to address inherent constraints/obstacles in order to facilitate adaptation mainstreaming across sectoral policies in Seychelles. While significant progress has been made in mainstreaming climate adaptation into the agriculture, water and energy sectors, little progress seems to have occurred in the Blue Economy, forestry, and health sectors. The lack of progress in these sectors can be attributed to the absence of national policies and or lack of add-ons on adaptation projects in these sectors. For example, mainstreaming climate adaptation into sector policies and strategies have occurred on an ad hoc basis through different projects. Stakeholder further indicated that there are still many obstacles such as the lack of human and financial resources that need to be addressed to enhance climate adaptation mainstreaming especially in the health, agriculture and BE sectors. Further, sectoral objectives were given greater priorities when compared to adaptation objectives especially for sectors whose mandate were not directly linked to climate change. In fact, the issue of coordination and corporation not just among government entities, but also between the government and private sectors was highlighted another barrier. Strategies for improvement include long-term climate impact studies, better public-private partnership, building on existing adaptation projects, ensure consistency in policy, and enhance access to resources – human, technical and financial. Lastly, adaptation mainstreaming is a process that should institutionalized across sector to promote sustainable growth.