Background: This descriptive survey research aims to develop the Nonviolent Communication Questionnaire (NVCQ) Materials and Methods: The subscales' items of NVC including Observation, Feelings, Needs, Demands and Empathy were validated. All items were evaluated and established by psychologist. The first draft of the questionnaire was conducted on 80 individuals and the data were analyzed. Items with less than 30% load were excluded. Then, the questionnaire was conducted on 500 Police Special Force Officers. In order to verify the construct validity, two questionnaires comprising the Beck Depression Inventory (BDI) and the Communication Skills (CSQ) were conducted along with the research questionnaire Results: The first draft of the questionnaire has conducted on 80 individuals and Items with less than 30% load were excluded from the questionnaire and the results confirmed the scale validation (Cronbach's alpha = 0.94). Then, the questionnaire was conducted on 500 Police Special Force Officers (Cronbach's alpha = 0.95). The results showed significant and negative correlation between the NVCQ (the researcher-made questionnaire) and the BDI (P = 0.01) and significant and positive correlation between the NVCQ and the CSQ (P = 0.01). Conclusion: The results show that the researcher-made questionnaire is a valid and reliable questionnaire to measure NVC.