The relationship between audit quality and earnings management has not been tested with consideration of key audit matters as a mediating variable. This study examined whether audit quality (AQ) decreases earnings management (EM) in shareholding corporations through improving key audit matters (KAMs) in Jordan’s emerging environment. A regression analysis was carried out on a sample that included financial reports and auditor reports of 105 industrial and service shareholdings companies listed on the Amman Stock Exchange (ASE) from 2017 to 2019. The study found a negative relationship between audit quality and earnings management. The results showed that audit quality increases key audit matters, which, in turn, decreases earnings management. Also, the study confirmed the mediating effect of KAMs between audit quality and earnings management. The study confirms the importance of key audit matters to provide more relevant and useful information for the users of financial reports and provides important indications to the regulatory authorities and standards bodies that key audit matters should be given more attention regarding the way that they are presented and disclosed.