Sunny Beach (Bulgarian: Слънчев Бряг, Slânchev Bryag) is a town on the Black Sea coast of Bulgaria, located approximately 35 km north of Burgas in Obshtina Nessebar, Burgas Oblast. It is Bulgaria's biggest and most popular holiday resort, and is home to over 120 hotels. It has been undergoing continuous expansion for many years.

Sunny Beach has a very small permanent population, but during the summer the town is home to many thousands of tourists. The main strip of high-rise hotels backing onto the beach is several kilometres long and extends along a wide bay between Sveti Vlas and Nessebar.

The climate of the area is Mediterranean, explaining Sunny Beach's popularity with tourists since before the fall of communism. Since that time the resort's popularity has grown among German holidaymakers, who add to the already large numbers of Bulgarian and Russian visitors. More recently, Sunny Beach has begun to attract the attention of British and Scandinavian tourists, for whom it is a more affordable alternative to the established Mediterranean resorts.

Attractions for tourists include the beach, watersports, nightlife, and the nearby historical site of Nessebar. Sunny Beach is popular with both families and young people.

The English name Sunny Beach is not an invented marketing term but a translation of the town's Bulgarian name. Similarly, Sunny Beach is known in German as Sonnenstrand.