Natsumikan (ナツミカン, 夏蜜柑, lit. "summer tangerine"; Citrus natsudaidai) is a fruit of Japan developed in 1740 with a particularly tart/sour taste.
Many Natsumikans are planted in the gardens of residences in Yamaguchi prefecture. The city of Hagi is famous for Natsumikan, particularly Natsumikan juice and ice cream.