Purpose This study aims to investigate the factors affecting the professional judgment of auditors in Iraq (personality type, audit firm size and age). Design/methodology/approach The statistical population includes 1,750 participants, and the sample size was determined to be 309 participants using Cochran’s sampling formula. The required data has been collected through a questionnaire. Regression factor analysis, Kolmogorov–Smirnov, t and Friedman(f) tests were used to analyze the variables and examine their relationships. Findings The results show a significant relationship between neuroticism, extroversion, flexibility, agreeableness and conscientiousness and auditors’ professional judgment. No relationship was observed between the size of the auditing firm and professional judgment. The results also showed a significant relationship between seniority and auditors’ professional judgment.

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