| Castellet i la Gornal | |
| Settlement Type: | Municipality |
| Flag Size: | 125px |
| Pushpin Map: | Spain Province of Barcelona#Spain |
| Pushpin Map Caption: | Location in Catalonia |
| Coordinates: | 41.253°N 1.592°W |
| Subdivision Type: | Country |
| Subdivision Name: |  Spain |
| Subdivision Type1: | Community |
| Subdivision Type2: | Province |
| Subdivision Name2: | Barcelona |
| Subdivision Type3: | Comarca |
| Subdivision Name3: | Alt Penedès |
| Leader Title: | Mayor |
| Leader Name: | Miguel Delgado Almansa (2015)[1] |
| Area Footnotes: | [2] |
| Area Total Km2: | 47.5 |
| Elevation M: | 137 |
| Population Density Km2: | auto |
| Population Demonym: | Castelletenc |
| Postal Code Type: | Postal code |
| Postal Code: | 08058 |
Castellet i la Gornal (pronounced as /ca/) is a municipality in the comarca of the Alt Penedès in Catalonia, Spain. It is situated in the valley of the Foix river at the point where it crosses the Coastal Range. The river is dammed to form the Foix reservoir. The ajuntament (town hall) is in La Gornal. The municipality is served by the N-340 road, and by a local road to Vilanova i la Geltrú.
Population is dispersed among the villages of La Gornal, Les Cassettes, Castellet, Torrelletes, Les Masuques, Clariana, Sant Marçal i Masies de Sant Marçal, Rocallisa, Valldemar, Els Rosers, La Creu i els Àngels, and Trencarroques.
Castellet i la Gornal became part of the Alt Penedès in the comarcal revision of 1990: previously it formed part of the Garraf.
Singer Marina Rossell was born in the village of La Gornal.[3]