In previous researches, the connections between customer perception of greenwashing and loyalty have been considered, but many have overlooked the potential mediating effect of customer trust. This particular investigation endeavours to address a notable gap in existing literature through an in-depth exploration of the intersection between the fintech industry and green-washing. This research investigates how perceived green-washing, through customer trust, impacts customer loyalty toward fintech companies in Nigeria. 314 valid and completed questionnaires were received from both male and female fintech company customers using an online questionnaire with a five-point Likert-type scale. Results revealed a significant, albeit modest, positive impact of perceived green-washing on Customer Loyalty (CL), largely driven by the influence of Customer Trust (CT). Secondly, CT plays a positive mediation effect in this relationship. These research findings contribute to existing literature by emphasizing the role of CT as a mediating factor. In practice, this study suggests that financial technology companies should prioritize creating and nurturing trust to enhance CL through transparent communication, ethical business practice as well as clear and accurate environmental claims.