| Honorific-Prefix: | Major general |
| Alexander Cosby Jackson | |
| Order: | 11th |
| Office: | General Officer Commanding, Ceylon |
| Term Start: | 1812 |
| Term End: | ? |
| Predecessor: | Robert Brownrigg |
| Successor: | Edward Barnes |
| Birth Date: | 16 Oct 1772 |
| Birth Place: | Bombay, India |
| Death Date: | 29 Jan 1827 |
| Death Place: | Dawlish, Devonshire, England |
| Birthname: | Alexander Cosby Jackson |
| Spouse: | Elizabeth Catherine Mitchell (1792-1861) |
| Children: | Charles Robert Mitchell Jackson |
| Occupation: | British Military Army |
| Allegiance: | United Kingdom |
| Branch: | British Army |
| Rank: | Major-General |
| Unit: | 66th (Berkshire) Regiment of Foot |
| Commands: | General Officer Commanding, Ceylon |
Major general Alexander Cosby Jackson (1773–1827) was the 11th General Officer Commanding, Ceylon. He was appointed in 1812. He was succeeded by Edward Barnes.