Athlete burnout symptoms are detrimental to athlete well-being. Obsessive passion has been identified as an antecedent of athlete burnout, with basic psychological need satisfaction potentially mediating this process. The aim of the current research was to extend on previous work and examine whether the relationship between passion and athlete burnout was mediated by psychological need satisfaction in a heterogeneous sample. Participants were 120 competitive athletes (Mage = 22.04, SD = 5.83) from 21 different sports. Each participant completed the Passion Scale, Basic Psychological Needs in Sport Scale, and the Athlete Burnout Questionnaire. Multiple regression and bootstrapping procedures were used to analyze the data. Passion (harmonious and obsessive) was found to share a significant relationship with sport devaluation but shared no significant relationship with emotional and physical exhaustion and reduced sense of accomplishment. Bootstrapping results suggested that the basic psychological need of autonomy was the only significant mediating variable in the relationship between passion (harmonious and obsessive) and burnout (sport devaluation). Potential antecedents and consequences of athlete burnout, alongside applied and conceptual implications are discussed.