John Morris, Baron Morris of Aberavon, was a British politician. He was a Labour Party Member of Parliament for over 41 years, from 1959 to 2001, which included a period as Secretary of State for Wales from 1974 to 1979 and as Attorney General between 1997 and 1999. He was the last living former Labour MP who was first elected in the 1950s. He was also the last surviving member of Harold Wilson's 1974–76 cabinet, and was the longest-serving Privy Counsellor at the time of his death. His combined parliamentary service totalled over 60 years.

The secretary of state for Wales, also referred to as the Welsh secretary, is a secretary of state in the Government of the United Kingdom, with responsibility for the Wales Office. The incumbent is a member of the Cabinet of the United Kingdom.