Takkoku-no-Iwaya is a temple located in Iwate Prefecture, Japan. The temple is known for its unique location, as it is built into a natural cave formation. The name Takkoku-no-Iwaya literally means "cave temple on the towering rock".

The temple was founded in the 8th century during the Nara period, and is one of the oldest temples in northern Japan. It was built by a monk named Jikaku Daishi, who was believed to have been a disciple of the famous monk Kukai. The temple was originally built as a hermitage for Jikaku Daishi, but over time it grew to become a major center of Buddhism in the region.

The main hall of Takkoku-no-Iwaya is located inside the cave, and is surrounded by various smaller buildings and shrines. The cave itself is a natural wonder, with various stalactites and stalagmites adding to the unique atmosphere of the temple. There is also a large rock outcropping above the cave which is said to resemble a dragon, and is a popular spot for visitors to take pictures.