This study examined the association between fair value accounting and reliability of accounting information. The study adopted survey research along with quantitative methods. Users of the accounting information represented by corporate investment analysts and corporate portfolio managers were the respondents for the purpose of this study. The population size was one hundred and sixty-one (161) users of accounting information decomposed into one hundred (100) corporate investment analysts and sixty-one (61) corporate portfolio managers. The primary source of data was employed with the structured questionnaire as an instrument used to collect the data. Data was collected through the administration of 161 copies of the questionnaire to both corporate investment analysts and corporate portfolio managers. One hypothesis was formulated and was tested using the Pearson product moment correlation technique at a significant level of 5% and 10% while the Statistical Package for Social Science (SPSS) was engaged to analyze the data. Findings revealed a significant association between fair value accounting and reliability of accounting information of the firms in Nigeria. Hence, the study recommended that adequate and regular training programs and conferences on fair value accounting application have to be organized. This is because most of the employees of the companies in Nigeria did not understand how to use fair value in an inactive market, appropriately. Thus, it is of great importance that they were trained to understand different valuations and estimation techniques of fair value; how and when to apply them in the measurement of assets and liabilities in the financial statement.