In Nigeria, the application of accounting ethics has gained significant attention due to increased
awareness of corporate social responsibility but the rising demand for sustainable business
practices is low. The effective implementation of sustainability practices has not been advocated
by many firms due to unclear direction as to who is responsible for what, hindered by ethical
challenges and large volume of financial reporting within the accounting profession. Hence, the
study aimed to investigate the effect professional accounting ethics (integrity, objectivity,
professional competency and due care, confidentiality and professional behaviour) on
sustainability advocacy in Nigeria. Survey research design was adopted and the use of regression
method of analysis was employed to analyse the generated data. The sample size was 384
professional and certified accountants who are members of ICAN, ACCA and ANAN. The field
data generated were normalized, valid and reliable for this study. Finding revealed that
professional accounting ethics (integrity, objectivity, professional competency and due care,
confidentiality and professional behaviour) significantly enhance environmental, social and
governance advocacies in Nigeria. The study concluded that professional accounting ethics of
integrity, objectivity, professional competency and due care, confidentiality and professional
behaviour improve sustainability advocacy via environmental, social and governance advocacies
in Nigeria. Thus, the study recommended that various organizations should embrace professional
accounting ethics of integrity, objectivity, professional competency and due care, confidentiality
and professional behaviour among accountants in order to enhance sustainability advocacy in
Nigeria.