John Aitchison (22 July 1926 – 23 December 2016) was a Scottish statistician.
He studied at the Universities of Edinburgh and Cambridge.
From 1966 to 1976 he was Titular Professor of Statistics and Mitchell Lecturer in Statistics at the University of Glasgow.
He was made a Fellow of the Royal Society of Edinburgh in 1968.
In 1976 he joined the University of Hong Kong as the founding Professor of Statistics.
On his retirement from the University of Hong Kong in 1989, he joined the University of Virginia as Professor and Chairman of Division of Statistics.
In 1986 he published the book The Statistical Analysis of Compositional Data, the key reference to date on the analysis of compositional data.
In 1952, he married Muriel Shackleton and they had three children together.