Neuromarketing is crucial in sustainable finance as it helps create more impactful campaigns by understanding and influencing the subconscious drivers of investor behaviour, thereby increasing engagement with and adoption of green investments. This article delves into the innovative application of neuromarketing within the field of sustainable finance, focusing on real-world case studies that showcase how green investment promotions have successfully influenced investor behaviour. Through an analysis of specific campaigns, this study reveals how neuromarketing techniques—such as brain imaging, eye-tracking, and emotional analytics—have been utilized to craft compelling messages that resonate with investors on a deeper, subconscious level. The case studies highlight the practical outcomes of integrating neuromarketing into green finance initiatives. The article provides valuable insights for financial institutions, marketers on how to leverage neuromarketing to promote green investments more effectively, ultimately contributing to the broader goal of sustainable development.