This has proved to be a very hard task and so far I only have a few names with large gaps in between, no years of service as the Commanding Officer:

20th Regiment of Light Dragoons – Disbanded 1763

20th Light Dragoons 1779 – 1783

20th Light Dragoons 1791 – 1819

1791 – ????      Lt. Col. Farringdon-Gardner

20th Light Dragoons 1861 (Later renamed the 20th Hussars)

1862 – 1872  Lt. Col. Henry James Stannus C.B. (First CO 20th Hussars)

1914 – 1915  Lt. Col. G. T. G. Edwards

1915 – 1918  Lt. Col. G. T. R. Cook

1918 – 1919  Lt. Col. ? Little

1919 – ???? Lt. Col. M. C. Richardson