| Sussex-Fundy-St. Martins | |
| Province: | New Brunswick |
| Prov-Status: | active |
| Prov-Created: | 1973 |
| Prov-Election-First: | 1974 |
| Prov-Election-Last: | 2020 |
| Prov-Rep: | Tammy Scott-Wallace |
| Prov-Rep-Party: | Progressive Conservative |
| Prov-Rep-Party-Link: | Progressive Conservative Party of New Brunswick |
| Demo-Census-Date: | 2011 |
| Demo-Pop: | 15978 |
| Demo-Electors: | 11118 |
| Demo-Electors-Date: | 2013 |
| Demo-Cd: | Kings, Saint John, Albert |
Sussex-Fundy-St. Martins is a provincial electoral district for the Legislative Assembly of New Brunswick, Canada. It was created as Kings East in 1973 and was slightly altered in the subsequent redistributions of 1994, 2006 and New Brunswick electoral redistribution, 2013. Its name was changed from Kings East to Sussex-Fundy-St. Martins in the 2013 redistribution, while gaining parts of Hampton-Kings and Saint John-Fundy in the process.
The riding name refers to Sussex Parish, the Bay of Fundy and Fundy-St. Martins.