John Alexander Spens MVO RD (7 June 1933 – 14 January 2021) was a Scottish lawyer and officer of arms.
He was educated at Rugby School, Corpus Christi College, Cambridge and the University of Glasgow.
He was a partner of the legal firm Maclay, Murray and Spens, and a director of Scottish Amicable Life Assurance Society and Standard Property Investment Ltd.
He was a commissioned officer in the Royal Naval Reserve, attaining the rank of lieutenant commander and being awarded the Decoration for Officers of the Royal Naval Reserve in 1970.
Spens was Carrick Pursuivant of the Court of the Lord Lyon from 1974 to 1985, and Albany Herald from 1985 to 2011.