Research indicates that pro-environmental behaviour (PEB) is related to mental well-being (MWB), although the possible directions of this relationship remain unclear. Furthermore, most of this research has predominantly focused on WEIRD (Western, Educated, Industrialised, Rich, Democratic) in the Global North, while only a few studies have included individuals from the Global South. This poster explores how the relationship between PEB and MWB is conceptualized within the Indonesian context. We examine the understanding of relationship between PEB and MWB in Indonesia by conducting a qualitative study that involved semi-structured interviews with 30 individuals from urban and rural areas during August and September 2024. Some initial key findings include the understanding of the type of PEB, everyday green habits, cultural values, personal-social motivations and agency, and structural barriers may promote (and hinder) the relationship between PEB and MWB.