Haeinsa (해인사(海印寺; "Haein Temple") in Korean) is one of the foremost Buddhist temples in South Korea, most notable because it is the home of the Tripitaka Koreana, the whole of the Buddhist Scriptures carved onto 81,258 wooden printing blocks. Haeinsa is located on Gaya Mountain in South Gyeongsang Province.

Haeinsa is considered one of the Three Jewel Temples of Korea. It is still an active Seon practice center in modern times, the home temple of the influential Rev. Seongcheol, who passed away in 1993.

Haeinsa was first built in 802 or 892 (the editor needs to confirm which is the correct date). Haeinsa and the Tripitaka Koreana were added to the UNESCO World Heritage list in 1995.

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