Teaching codes of conduct form part of the ethics infrastructure of universities seeking to raise teaching standards and promote academic integrity. This study investigated the existence of publicly posted codes of conduct for undergraduate teaching in a random sample of 100 universities ranked among the Times Higher Education World University Rankings top-400 institutions. Based on DiMaggio & Powell's model of institutional isomorphism, we posited the Times Higher Education World University Rankings top-400 institutions as an organizational field. Findings reveal tepid isomorphic pressures to publicly post teaching codes of conduct among the top universities. Lower-ranked universities post codes with tenets very protective of students as clients and whose ethical infringement have legal ramifications, such as not harassing students or teaching while intoxicated from alcohol or drugs. Since a code of conduct may increase faculty members' sensitivity to ethical issues but not actually promote ethical behavior, we recommend reinforcement activities for faculty members.