Geoffrey Thomas Barnes, CBE, JP (18 August 1932 - 11 February 2010) was a British government official, civil servant, military serviceman and author.
Barnes held a number of posts in the government of Sarawak and later in the government of Hong Kong, his first major post being the Deputy Secretary for Security, a department for which he would later serve as Secretary in the late 1980s.
Barnes also served as Deputy Secretary for Health and Welfare and as the 4th Commissioner of the Independent Commission Against Corruption.