text: * Roland Clift Developer of Life cycle assessment and broadcaster on environmental issues
  * John Coulson (1910–1990) Co-writer of classic UK textbooks
  * M. B. Donald (1897 - 1978) Fourth Ramsay professor of Chemical engineering at University College London. Former honorary secretary and vice-president of IChemE, Institution's Donald medal named after him. 
  * Sir Arthur Duckham (1879–1932) First President of the IChemE
  * Ian Fells Noted energy expert and popular science broadcaster
  * Trevor Kletz (1922-2013) Noted safety expert
  * Ashok Kumar (1956–2010) UK Member of Parliament
  * Frank Lees (1931–1999) author of major safety encyclopaedia
  * Bodo Linnhoff His 1979 PhD thesis led to Pinch Technology which has enabled companies to save large amounts of energy
  * K. B. Quinan (1878–1958) An American who, according to Lloyd George "did more than any other single individual to win the (First World) War" 
  * Jack Richardson (1929–2011) Co-writer of classic UK textbooks
  * P. N. Rowe (1919-2014) Fifth Ramsay professor of chemical engineering at University College London. He was president of the Institution between 1981 and 1982.
  * Meredith Thring (1915–2006) prolific inventor, futurologist and early proponent of sustainability