This thesis aims to contribute to a deeper understanding of how and to what extent, NATO frames human security notions through its security discourse. The study seeks to shed light on the relevance of the concept of human security within NATO’s security discourse considering the recent events in Europe following the Russian invasion of Ukraine, where scholars predict a return of realist approaches. The framing of human security notions in NATO’s security discourses is analysed with a theoretical framework on critical human security, from the 1990s when the concept of human security was first developed. The analysis consists of a frame analysis of NATO’s three latest Strategic Concepts from 1999, 2010 and 2022 as well as official statements made by the Secretary Generals during the selected periods. NATO’s framing of human security issues is analysed in line with the selected frames’ perceived threat, means to obtain security and referent object. The analysis concludes that NATO’s framing of human security notions evolved in line with how NATO perceived the security climate. The invasion of Ukraine by Russia in 2022 led to more traditional security approaches within NATO’s security discourse. Nevertheless, NATO’s framing of human security was not overshadowed by the changing security climate but rather adapted to it.