The Ayvaini Cave is a cave located inside the borders of the Ayva village of Bursa, Turkey.
Except for the entrance section, the cave is horizontally developed. There are two entrances to the cave; one at Doğanalanı, the other at Ayvaköy. Entering the cave from one point and leaving the cave from another is possible. At the Doğanalanı entrance of the cave, there is a vertical downward descent of 17 meters.