Mindfulness, imagery, and acceptance-based interventions have been widely applied within the sport and performance psychology domain. This paper presents a novel imagery method termed ‘Performance Mindfulness,’ which synthesizes insights from the Acceptance and Commitment Therapy (ACT) Matrix tool, the Physical, Environmental, Task, Timing, Learning, Emotion, Perspective (PETTLEP) imagery method, and principles of mindfulness. As existing imagery techniques are limited in effectively capturing the motivational and emotional dimensions of athletic performance, this integrated approach introduces a well-conceptualized, evidence-based framework rooted in Contextual Behavioral Science. This framework translates insights from the ACT Matrix into a practical tool within the imagery process and integrates principles of mindfulness to enhance the effectiveness of imagery. Performance Mindfulness is tailored for sport psychology practitioners who seek to incorporate acceptance and mindfulness principles into the mental preparation of athletes at various levels. The paper provides a detailed explanation of the technique, including concrete examples, and discusses its advantages and disadvantages comprehensively.