| Benicàssim | |
| Settlement Type: | Municipality |
| Official Name: | Benicasim / Benicàssim |
| Native Name: | |
| Pushpin Map: | Spain Valencia #Spain |
| Subdivision Type: | Country |
| Subdivision Name: |  Spain |
| Subdivision Type1: | Autonomous community |
| Subdivision Type2: | Province |
| Subdivision Name2: | Castellón |
| Subdivision Type3: | Comarca |
| Subdivision Name3: | Plana Alta |
| Subdivision Type4: | Judicial district |
| Subdivision Name4: | Castellón de la Plana |
| Coordinates: | 40.0553°N 0.0642°W |
| Elevation M: | 15 |
| Area Total Km2: | 36.1 |
| Population Demonym: | Benicense Benicassut/da |
| Population Density Km2: | auto |
| Blank Name Sec1: | Official language(s) |
| Blank Info Sec1: | Spanish and Valencian |
| Timezone: | CET |
| Utc Offset: | +1 |
| Timezone Dst: | CEST |
| Utc Offset Dst: | +2 |
| Postal Code Type: | Postal code |
| Postal Code: | 12560 |
| Area Code Type: | Dialing code |
| Leader Title: | Alcalde |
| Leader Name: | Francesc Colomer Sánchez (2007) |
| Leader Party: | PSOE |
Benicàssim (pronounced as /ca-valencia/; es|'''Benicasim''' pronounced as /es/); officially Benicasim / Benicàssim;[1] ar|بنو قاسم|translit=banū qāsim, or ar|بني قاسم|translit=banī qāsim|label=none, according to numismatic findings)[2] is a municipality and beach resort located in the province of Castellón, on the Costa del Azahar in Spain. The Desert de les Palmes mountain range further inland shelters the town from the north wind. The name is derived from the Banu Qasim tribe, a segment of the Kutama Berbers that settled the area during the 8th century Arab conquest of Spain.
Benicàssim is located 13 km north of the town of Castellón de la Plana, at the north end of the Valencian Community. The town has a population of 18,991 (2021). Its economy is largely based on tourism; the town is well known for its beaches and its music festivals such as Festival Internacional de Benicàssim (FIB) and the Rototom Sunsplash.
Benicàssim has 6 kilometers of sandy beaches linked by a promenade. The five beaches in this stretch of coast are named
See main article: Desert de les Palmes Mountains and Desert de les Palmes Natural Park. Just inland from Benicàssim lies the Desert of the Palms (Valencian: Desert de les Palmes; Spanish: Desierto de las Palmas). The area is not a literal desert, but a protected natural area and a small mountain range with a maximum elevation of 729 meters (at the peak of Mount Bartolo). The Columbretes Islands are visible from the top of the range on clear days.
The Via Verda or Vía Verde (Green Way) is a 5.5 km long cycle and walking path along the rugged coast between the resort towns of Benicàssim and Oropesa del Mar (Orpesa).