The Jackson-Gwilt Medal is an award that has been issued by the Royal Astronomical Society (RAS) since 1897. The original criteria were for the invention, improvement, or development of astronomical instrumentation or techniques; for achievement in observational astronomy; or for achievement in research into the history of astronomy. From 2017 onwards, the history of astronomy category has been removed and transferred to a new award, the Agnes Mary Clerke Medal.
The frequency of the medal has varied over time. Initially it was irregular, with gaps of between three and five years between awards. From 1968 onwards it was awarded regularly every three years; from 2004 every two years; and since 2008 it has been awarded every year.
The award is named after Hannah Jackson née Gwilt. She was a niece of Joseph Gwilt (an architect and Fellow of the RAS) and daughter of George Gwilt (another Fellow); Hannah donated the original funds for the medal. It is the second oldest award issued by the RAS, after the Gold Medal. 
List of winners
Source except where otherwise noted
This list (which may have dates, numbers, etc.) may be better in a sortable table format. (September 2017)
- 2017 Ian Parry
- 2016 Bruce Swinyard
- 2015 Allan Chapman
- 2014 George W. Fraser
- 2013 Vikram Dhillon
- 2012 Joss Bland-Hawthorn
- 2011 Matt Griffin
- 2010 Craig Mackay
- 2009 Peter Ade
- 2008 Stephen Shectman
- 2006 Keith Taylor
- 2004 Pat Wallace
- 2001 John E. Baldwin
- 1998 Alexander Boksenberg
- 1995 Janet Akyüz Mattei
- 1992 Richard Stephenson
- 1989 Richard Edwin Hills
- 1986 David Malin
- 1983 Grote Reber
- 1980 Roger Griffin
- 1977 Patrick Moore
- 1974 Geoffrey Perry
- 1971 Alan William James Cousins
- 1968 John Guy Porter
- 1963 George Eric Deacon Alcock
- 1960 Frank Bateson and Albert F. A. L. Jones
- 1956 Reginald Purdon de Kock
- 1953 John Philip Manning Prentice
- 1949 Algernon Montagu Newbegin
- 1946 Harold William Newton
- 1942 Reginald Lawson Waterfield
- 1938 Frederick J. Hargreaves and Percy Mayow Ryves
- 1935 Walter Frederick Gale
- 1931 Clyde William Tombaugh
- 1928 William Reid and William Herbert Steavenson
- 1923 A. Stanley Williams and William Sadler Franks
- 1918 Theodore E. R. Phillips
- 1913 Thomas Henry Espinell Compton Espin
- 1909 Philibert Jacques Melotte
- 1905 John Tebbutt
- 1902 Thomas David Anderson
- 1897 Lewis Swift
- Webb, Annette. "Agnes Mary Clerke Medal for Historical Research in Astronomy or Geophysics". www.ras.org.uk. Retrieved 7 September 2017.
- Down, Emily. "Jackson-Gwilt Medal". www.ras.org.uk. Royal Astronomical Society. Retrieved 7 September 2017.
The Jackson-Gwilt Medal, after the Gold Medal the oldest offered by the Society, derives from a gift by Mrs Hannah Jackson-Gwilt, niece of the well-known architect and former fellow, Joseph Gwilt. She gave the Society a capital sum which was to be used after her death for the award of a medal and a cash prize.
- "Lists of Medallists, Prize Winners and Lecturers". www.ras.org.uk. Royal Astronomical Society.
- Hollis, Morgan. "Winners of the 2017 awards, medals and prizes - full details". www.ras.org.uk. Royal Astronomical Society. Retrieved 15 September 2017.
- "RAS honours leading astronomers and geophysicist". RAS. 8 January 2015. Retrieved 9 January 2015.
- "2015 winners of the RAS awards, medals and prizes". Royal Astronomical Society. 9 January 2015. Retrieved 9 January 2015.
- "Winners of the 2014 awards, medals and prizes - full details". Royal Astronomical Society. Archived from the original on 28 March 2014. Retrieved 19 March 2014.
- "2013 winners of the RAS awards, medals and prizes". Royal Astronomical Society. 10 January 2013. Retrieved 13 January 2013.
- "RAS honours leading astronomers and geophysicists". Royal Astronomical Society. Retrieved 16 August 2013.
- "The award of the Jackson-Gwilt Medal and Gift jointly to Mr F. M. Bateson and Mr A. F. A. L. Jones (address)". Quarterly Journal of the Royal Astronomical Society. 1: 27. 1960. Bibcode:1960QJRAS...1...27.