List of Famous people who are 81

Angus John "Gus" Macdonald, Baron Macdonald of Tradeston, CBE, PC is a Scottish television executive, life peer and former Labour member of the House of Lords.

John Robert Menard Jr. is an American billionaire businessman, and the founder and owner of Menards, a Midwestern chain of home improvement stores. He is a former INDYCAR racing team owner, and the father of former NASCAR Cup Series driver Paul Menard. He is the son of John Robert Menard Sr (1917–1988). As of 11 June 2021, Bloomberg Billionaires Index ranked him the 103rd-richest person in the world with a net worth of US$18.9 billion.

José Sarukhán Kermez is a plant biologist and ecologist. He is currently the National Coordinator for Mexico’s National Commission for Knowledge and Use of Biodiversity (CONABIO). He received a B.A. from National Autonomous University of Mexico (UNAM) in 1964, a Masters from Postgraduate College (Chapingo), and a Ph.D. (Ecology) from the University of Wales. A known expert in Mexican biology, Sarukhán’s main interests include tropical ecology, plant population ecology, and the systems ecology of both temperate and tropical ecosystems, as well as training and education and has published over 110 research papers and authored and co-authored several books.

John Patrick Byrne is a Scottish playwright and artist. He wrote The Slab Boys Trilogy, plays which explore working-class life in Scotland, and the TV dramas Tutti Frutti and Your Cheatin' Heart. Byrne is also a painter, printmaker and theatre designer.

John Sewell, CM is a Canadian political activist and writer on municipal affairs; he was the mayor of Toronto, Ontario from 1978 to 1980.