| Honorific-Prefix: | His Excellency |
| Jan Glastra van Loon | |
| Office: | Parliamentary leader in the Senate |
| Term Start: | 16 September 1980 |
| Term End: | 3 December 1985 |
| Predecessor: | Doeke Eisma (1977) |
| Successor: | Jan Vis |
| Parliamentarygroup: | Democrats 66 |
| Office1: | Member of the Senate |
| Term Start1: | 16 September 1980 |
| Term End1: | 8 June 1999 |
| Parliamentarygroup1: | Democrats 66 |
| Term Start2: | 6 November 1976 |
| Term End2: | 27 October 1979 |
| Leader2: | Jan Terlouw |
| Predecessor2: | Jan ten Brink |
| Successor2: | Henk Zeevalking |
| Office3: | State Secretary for Justice |
| Term Start3: | 13 June 1973 |
| Term End3: | 27 May 1975 |
| Primeminister3: | Joop den Uyl |
| Predecessor3: | Hans Grosheide |
| Successor3: | Henk Zeevalking |
| Birthname: | Jan Frederik Glastra van Loon |
| Birth Date: | 1920 3, df=y |
| Birth Place: | Batavia, Dutch East Indies |
| Death Place: | The Hague, Netherlands |
| Nationality: | Dutch |
| Party: | Democrats 66 |
| Children: | 4 children |
| Alma Mater: | Leiden University (Bachelor of Laws, Master of Laws, Doctor of Philosophy) |
| Occupation: | Politician · Jurist · Lawyer · Judge · Researcher · Nonprofit director · Academic administrator · professor · Author |
Jan Frederik Glastra van Loon (16 March 1920 – 22 October 2001) was a Dutch politician of the Democrats 66 (D66) party.
| Honours | ||||
| Ribbon bar | Honour | Country | Date | Comment |
|---|---|---|---|---|
| Knight of the Order of the Netherlands Lion | Netherlands | 1 October 1975 | ||
| Commander of the Order of Orange-Nassau | Netherlands | 28 April 1995 | ||