This study examined the knowledge and use of the 2011 Freedom of Information Act among journalists in Nigeria. The hierarchy of influences model provided the theoretical lens, which guided the study. Through a survey of 313 Nigerian journalists, the study found that there was a high level of knowledge of the Act among Nigerian journalists. Nigerian journalists perceived the Act as a useful journalistic tool, and they often used it for such purposes as confirming facts, writing controversial topics and to gain insight into the inner working of government. The study showed that, in the use of the Act in journalistic duties, Nigerian journalists were confronted with the challenges of non-integration of the provisions of the Act in the operations of government agencies, adversarial disposition of government institutions towards journalists and the pervasive culture of secrecy. The study established that knowledge of the Act positively correlated with its use. The implications of the findings were discussed.