| Derek Chunilall Jagan | |
| Honorific-Prefix: | The Honourable |
| Honorific-Suffix: | OR CCH SC JP MP |
| Birth Date: | 1930 5, df=y |
| Birth Place: | Port Mourant, Berbice, British Guiana (present-day East Berbice-Corentyne, Guyana)[1] |
| Death Place: | Georgetown, Guyana |
| Relatives: | Cheddi Jagan (brother) Janet Jagan (sister-in-law) Cheddi "Joey" Jagan Jr. (nephew) |
| Office: | Speaker of the National Assembly of Guyana |
| Term Start: | 17 December 1992 |
| Term End: | 15 October 2000 |
| Predecessor: | Sase Narain |
| Successor: | Martin Zephyr |
| Party: | People's Progressive Party |
| Spouse: | Roshenara Gajraj |
| Occupation: | Lawyer, politician |
Derek Chunilall Jagan [2] (25 May 1930 – 15 October 2000) was a Guyanese politician and lawyer. He served as Speaker of the National Assembly of Guyana from 1992 to 2000.[3] He died of an apparent heart attack while doing yard work in 2000.[4] He was the younger brother of former Guyanese president Cheddi Jagan.
In the early 1960s, Jagan was monitored by the British government during the Cold War.[5]
Jagan was elected (PPP/C) was elected speaker 17 December 1992. Upon his death, he was replaced by Winslow Martin Zephyr.[6]