| Honorific Prefix: | The Reverend |
| Thomas Garnier | |
| Birth Date: | 26 February 1776 |
| Birth Place: | Rookesbury, Hampshire, England |
| Death Place: | Winchester, England |
| Other Names: | Thomas Garnier the Elder |
| Occupation: | Clergyman, botanist |
| Spouse: | Mary Parry |
| Children: | 8, including Thomas and John |
| Father: | George Charles Garnier |
Thomas Garnier the Elder (26 February 1776 – 29 June 1873) was an English clergyman and botanist. He was Dean of Winchester from 1840 to 1872.
Thomas Garnier was born in Rookesbury, Hampshire, on 26 February 1776, the son of George Charles (1739–1819) and Margaret Garnier (d. 1807); his family was of Huguenot origin.[1] He was educated at Hyde Abbey School and matriculated at Worcester College, Oxford, in 1793; he became a Fellow of All Souls College and graduated BCL 1800 and DCL 1850.[2] He was appointed Rector of Bishopstoke, Hampshire, in 1807, retaining this with the deanery.
At Worcester College, Garnier's tutor was Stephen Long Jacob, who is said to have given him a taste for gardening. In 1798, encouraged by Sir Joseph Banks, he joined the Linnean Society of London.[3] He was a founding member of the Hampshire Horticultural Society in 1818. Dean Garnier's Garden in Winchester's cathedral close is named after him.
In the 1860s, he was an 'anti-muckabite' campaigner for a sewerage system for Winchester. The road to the town's first sewerage pumping station was later named after him.
Garnier was a friend of Palmerston and a staunch Whig. He died in Winchester on 29 June 1873.
In 1805, Garnier married Mary Parry, daughter of Caleb Hillyer Parry M.D. They had four sons and four daughters.[1] Of the sons: