This study examines the relationship between chief executive officers’ (CEOs’) characteristics (e.g., tenure, experience, education, age and compensation) and accounting conservatism for a sample of 672 yearly observations from both Jordanian industrial and service companies listed on the Amman Stock Exchange (ASE) during the period 2014–2021. Using feasible generalised least squares, the results show that CEOs with more experience and skills are positively and significantly related to accounting conservatism. Furthermore, consistent with upper-echelon-theory arguments, the findings reveal that CEO tenure is significantly and positively associated with the level of accounting conservatism. The results indicate that CEOs’ education, age and compensation are positively but insignificantly related to accounting conservatism. Overall, this study contributes to the literature by providing evidence of the importance of recognising the effects of CEOs’ characteristics on influencing accounting conservatism in Jordanian industrial and service companies.