哈洛德·亚德利安·罗素·金·费尔比（英语：Harold Adrian Russell "Kim" Philby或称H.A.R. Philby，1912年1月1日－1988年5月11日，OBE：1946-1965）是苏联在冷战时期潜伏在英国的间谍，暗中替苏联内务人民委员部和克格勃效力，提供情报。

费尔比生于印度，父亲St. John Philby是**的情报官员，曾是印度第一个总理贾瓦哈拉尔·尼赫鲁的同学。1930年代，费尔比在剑桥大学就读时加入***，1933年成为苏联的谍报人员。1940年正式被苏联吸收，并加入英国情报机构，负责反间谍任务。

Harold Adrian Russell "Kim" Philby (1 January 1912 – 11 May 1988) was a high-ranking member of British intelligence who worked as a double agent before defecting to the Soviet Union in 1963. He served as both an NKVD and KGB operative.

In 1963, Philby was revealed to be a member of the spy ring now known as the Cambridge Five, the other members of which were Donald Maclean, Guy Burgess, Anthony Blunt and, possibly, John Cairncross. Of the five, Philby is believed to have been most successful in providing secret information to the Soviet Union. His activities were moderated only by Joseph Stalin's fears that he was secretly on Britain's side. Philby was an Officer of the Order of the British Empire (OBE) from 1946 to 1965.