This thesis investigates the cross-sectional variation in the corporate governance practices and disclosures of corporations in Indonesia and Malaysia as documented in their annual reports and on the World Wide Web (WWW). Furthermore, it examines the impact of three institutional isomorphisms (coercive, mimetic, and normative) at the micro, meso, and macro level on corporate governance practices and disclosures by corporations in these two countries. It is concluded that institutional isomorphism at all three levels, micro, meso, and macro, is influential on corporate governance practice and disclosure improvements. This thesis provides empirical evidence on how coercive isomorphism, mimetic isomorphism, and normative isomorphism at the micro, meso, and macro levels influence corporate governance practices and disclosures. For example, improvement in corporate governance practices and disclosures by corporations in Indonesia as a consequence of the new Indonesian administration’s reform agenda is traced and illustrated. This thesis shows that foreign-educated directors in Indonesian corporations are asserting best international practice to improve the corporate governance disclosures of Indonesian corporations.Overall, the findings of this thesis suggest that regulators in the two countries should continue to encourage corporations to use the WWW for corporate governance disclosure. In addition, this thesis also proposes that both corporations and regulators need to recognise the importance of micro, meso, and macro level influences on corporate governance practices and disclosures.