Abstract The purpose of this study was Developing and Validation of psychologists’ professional ethics Ques-tionnaire for Counselors. The method of this study was Correlation. The population were counselors and psychologists in Tehran. The sample was 178 married men and women of consultants who have a bachelor's degree or higher. The instrument of this study was Ethics Ques‌tionnaire for Counselors. Factor analysis revealed five factors in the questionnaire: informed consent was 90.29 percent of the total variance, upholding the law and culture was 75.6% of the total variance, transparency in the relationship was 64/4 percent of the total variance, and responsibility in crisis counseling was 13.4 percent and ethics in applying was 89.3% of the total variance. Test-retest reliability coefficient of the scale was 0.81, and the internal consistency was 0.92. Ethics questionnaire regarding the validity and reliability was the right tool for the assessment of professional ethics for Counselors