The study analysed online financial reporting practices among listed manufacturing organisations and investigated the level of compliance with regulations. It determined the effect of corporate governance mechanisms on internet reportage of finance among manufacturing firms in Nigeria. These were done with a view to examining the relationship that exists between corporate governance mechanisms and internet financial reporting among Nigerian manufacturing firms. The study adopted a longitudinal research design. For this investigation, secondary data were used. The study's participants comprised 86 manufacturing firms quoted on the Nigerian Exchange Group (NGX) between 2012 and 2021. A total of 22 manufacturing companies were purposefully selected due to the availability of complete data during the research period and the adoption of IFRS. The data was collected from the websites of the manufacturing companies and their certified financial records. The data covered IFRS disclosure items classified into presentation format and content (FASB 2000), percentage of the independent director, composition of board committees, board diligence, audit committee size, non-executive director as part of the audit committee, internal control management (as mandated by CAMA 2003, CAMA 2020, SEC 2011, and NCCG 2018), and control variables (profitability and leverage). The results showed that corporate governance mechanism measured by board size (t = 5.09, p < 0.05), risk assessment (t = 5.34, p < 0.05), board diligence (t = 2.42, p < 0.05) had a significant effect on internet financial reporting, while Audit committee (t=1.8 p>0.05) had no significant effect on internet financial reporting among Nigeria manufacturing firms. The study concluded that corporate governance mechanisms enhanced internet financial reporting of quoted manufacturing companies in Nigeria