This study aimed to investigate the effect of an educational program based on the health action process approach (HAPA) on integrated pest management (IPM) adoption among greenhouse farmers in Jiroft, southern Iran. This quasi-experimental study was conducted on 300 greenhouse farmers in Jiroft, in 2021. Multistage sampling and random allocation were performed to select two groups of participants, control (n=150) and intervention (n=150). No intervention was performed on the control group. In the intervention we used a researcher-made questionnaire based on the HAPA constructs and IPM scores were registered. In the intervention group, the mean scores of all the constructs, except for recovery self-efficacy, increased after intervention. In addition, the IPM adoption in the medium IPM group increased [from 28 (18.66%) farmers to 119 (79.03%) farmers] significantly but no significant difference and/or increase was observed in the all of these variables in the control group after intervention. The HAPA-based educational program contributes positively to IPM adoption among greenhouse farmers پرونده مقاله