This study seeks to measure the level of responsible investment (RI) disclosure of the world's largest pension funds. The public disclosure of environmental, social and governance factors by the world's pension funds reflect their genuine commitment to this new investment paradigm. The UNPRI criterion is empoyed to measure the level of public disclosure. Overall, the level of public disclosure of RI activities is not prolific. The study is negatively influenced by North American pension funds who dominate this sample. Public disclosure practices are positive for European funds. The size of funds under management of each fund positively influences public disclosure of RI and reflects their leadership role in the industry.