Lake Kuttara

is a caldera lake in Shiraoi, Hokkaidō, Japan. It is part of Shikotsu-Tōya National Park. The lake is said to have the best water quality in all of Japan. The Ministry of the Environment says that it has a transparency of , so it is the second clearest lake (Lake Mashū is the clearest).
A salamander species, , lives at the lake. Since 1909, Sockeye salmon have been sent to the lake.