This study aimed to investigate the impact of accountants and auditors' personality traits on their attitudes towards some unethical professional practices. The study took the dark triad trait in its three dimensions (Machiavellianism - Narcissism - Psychopathy) as a model for it. By surveying a sample of accounting students at Zagazig University (175 individuals), the results indicated a positive relationship between the dark triad and unethical professional practices. As for the dimensions, it was found that there is a positive relationship between both Machiavellian and psychopathic and unethical professional practices, while the relationship was not significant between narcissism and unethical professional practices. The detailed research by breaking-down unethical professional practices into unethical professional practices with financial returns and unethical professional practices with moral returns, showed that the results were positive relationships between the dark triad (and its dimensions) and the two types of professional practices, except for the relationship between narcissism and unethical professional practices with moral returns, meaning that the narcissistic personality tends to accept unethical professional practices if only they generate financial returns.