| Fonds-Saint-Denis | |
| Commune Status: | Commune |
| Adjustable Map: | Locator map of Fonds-Saint-Denis 2018.png |
| Map Size: | 210px |
| Map Caption: | Location of the commune (in red) within Martinique |
| Coordinates: | 14.7389°N -61.1333°W |
| Arrondissement: | Saint-Pierre |
| Mayor: | Annick Guetty Comier[1] |
| Term: | 2020 - 2026 |
| Intercommunality: | CA Pays Nord Martinique |
| Elevation Min M: | 129 |
| Elevation Max M: | 1159 |
| Area Km2: | 24.28 |
| Insee: | 97208 |
| Postal Code: | 97250 |
Fonds-Saint-Denis (pronounced as /fr/; gcf|label=[[Martinican Creole]]|Fonsendèni, Fonsendini;) is a village and commune in the French overseas department and region, and island, of Martinique. It is the smallest commune of the island.
Fonds-Saint-Denis has a tropical rainforest climate (Köppen climate classification Af). The average annual temperature in Fonds-Saint-Denis is . The average annual rainfall is with July as the wettest month. The temperatures are highest on average in September, at around, and lowest in February, at around . The highest temperature ever recorded in Fonds-Saint-Denis was on 9 March 2010; the coldest temperature ever recorded was on 12 February 1966.