The term self-permission refers to a belief about the self that a person can hold, to a stronger or weaker extent. Self-permission, in short, is the answer an individual gives oneself when asking about their perceived allowance to reach overarching long-term objectives, such as having a fulfilling career or enjoying a lasting and gratifying relationship. At a broader level, the question is whether a person allows him or herself to lead a happy and rewarding life. This paper describes the concept of self-permission, explores its nomological network and possible antecedents and consequences, proposes a corresponding self-permission scale (SPS), and suggests a study for assessing 1) the psychometric properties of that scale, 2) its relationship with conjectured adjacent constructs, and 3) its relationship with psychological functioning. Considering how important it seems to be to most individuals to make the best out of their lives and to live up to a deeply felt sense of purpose, a better understanding of self-permission could significantly benefit the psychological well-being of many people who do not allow themselves to thrive.