About every two years the Colour Group awards its Newton Medal to a distinguished worker in the field of colour science, on the occasion of his or her delivery of The Newton Lecture.
| 1963 | Prof W D Wright | The rays are not coloured |
| 1965 | Dr W A H Rushton FRS | The chemical basis of colour vision and colour blindness |
| 1967 | Dr W S Stiles OBE FRS | Mechanism concepts in colour theory |
| 1970 | G J Chamberlain | What use is colorimetry? |
| 1972 | Dr D B Judd | Colour in visual signalling |
| 1975 | Dr R W G Hunt | Sky-blue pink |
| 1977 | Dr C J Bartleson | Full circle: The study of chromatic adaptation |
| 1979 | Dr S T Henderson | The colour of daylight |
| 1981 | Prof R A Weale | Game-set-match |
| 1983 | Dr B H Crawford | Colour in signals |
| 1985 | D L MacAdam | Uniform colour scales (delivered in 1984) |
| 1987 | Miss M B Halstead | Lighting and colour rendition: quantity versus quality |
| 1989 | W N Sproson | Colour television |
| 1991 | J G Holmes | Suiting colour to the name |
| 1993 | Prof S M Zeki FRS | Colour vision as a guide to brain organisation |
| 1995 | Dr R McDonald | The effect of colour physics on the textile industry |
| 1997 | Don Pavey | Aesthetics of colour and orientation |
| 1999 | Professor John D Mollon, FRS | The colour-sense: its origin and development |
| 2001 | John B Hutchings | Driving forces for colour usage in food, biological nature and human behaviour |
| 2003 | James H Nobbs | Relating the Composition of Materials to their Colour |
| 2006 | Prof Richard Langton Gregory, CBE, D.Sc., FRSE, FRS | Colours through a Bayes Window |
| 2008 | Prof Roy S Berns | The Use of Color Science in Art Conservation |
| 2010 | Prof Janos Schanda | Do LEDs need a new colorimetry? |
| 2012 | Prof Françoise Vienot | The Novelty of Metameric LED White Lights |
| 2014 | Prof Michael R Pointer | Progress Towards the Measurement of Appearance – Tortoise or Hare? |
| 2016 | Prof Andrew Stockman | Distorted Insights from Perceptual Anomalies to Colour Mechanisms |
| 2018 | Prof David Foster | The Randomness of Colours |
| 2020 | Prof M Ronnier Luo | Holy Grail of Colour Science – Version II |
| 2022 | Prof Anya Hurlbert | From Light and Matter to the Concept of Colour |