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Tsukuba (筑波郡, Tsukuba-gun) was a district located in Ibaraki Prefecture, Japan. At its greatest extent it included the areas of today's cities of Jōsō, Shimotsuma, Toride, Tsuchiura, Tsukuba, and Tsukuba Mirai. The district had two towns before the dissolution: Ina and Yawara. On March 27, 2006, the town of Ina and the village of Yawara were merged to create the city of Tsukubamirai. Therefore, Tsukuba District was dissolved as a result of this merger.