Objective: The present study aimed at investigating the causal relationship between parenting styles, attachment styles, and self-regulation among drug dependent individuals in Urmia city. Method: In this correlational/ descriptive research, the number of 449 addicts was chosen through multi-stage cluster sampling method from among the addicts who had referred to addiction treatment clinics in Urmia city. They then filled out the questionnaires, namely Parenting Styles Questionnaire (Zeinali, Sharifi, Enayati, Asgari, & Pasha, 2012), Self-Regulation Questionnaire (Carey, Neil, & Collins, 2004), and Attachment Styles Questionnaire (Van Oudenhoven, Hofstra, & Bakker, 2003). The collected data were analyzed by presenting two models through path analysis in AMOS software. Results: The results of this study showed that authoritarian and neglectful parenting styles have a significant negative effect on self-regulation; and authoritative and permissive parenting styles have a significant positive effect on self-regulation in fathers and mothers' model (P <0. 001). In both models, authoritative and permissive styles had a significant positive effect on secure attachment style (P <0. 001). The effect of authoritarian and neglectful styles on the secure attachment style was not significant in fathers' model, but it had a significant negative effect on the mothers' model (P <0. 05).