The celebrations take place 23 and 24 of June all over the island, but the main attraction is of course the festival in the village of San Juan itself.
There will be traditional folk dancing and games, concerts, and stands offering food and drinks.
On the night of 23 June - La nit de Sant Joan - there are bonfires and fireworks, including a ceremony involving people jumping over small fires.
The celebrations on the 24 June begin with a mass, followed by a procession from the church to the town centre. The day ends with an amazing firework display.
On the night of San Juan on the 23 June there are also celebrations and fires in the other towns and villages of the island, for example in Ibiza Town, Santa Eulalia, San Antonio, Santa Gertrudis, San Rafael and San Agustín.