Background& Objectives: Natural methods of birth control are widely used by couples.. The aim of this study was to determine the effects of group discussion on knowledge, attitude and practice of women using natural family planning methods in Alborz city, Qazvin.

Methods: This interventional study was conducted in 147 sexually active, married 15-49 year-old women who were current users of natural methods from at least 3 months ago in Alborz city and didn’t expect a child. The subjects were selected using systematic random sampling method. Knowledge, attitude and practice of the subjects were examined by a questionnaire before and 4-6 months after the intervention. The differences between groups (before and after intervention) were assesed by (Ttest, Qi Square tests) using SPSS-16.

Results: After intervention, the Percentage of aware women about Conteraceptive methods were increased.The attitude and practice of women were significantly improved (p<0.001). There wasnot significantly increased in aware women about contraceptive pills after intervention.

Conclusion: Implemented group discussion had positive effect on increasing of aware women about contraceptive methods. Also more women had appropriate attitude and correct behavior after intervention.