Lady Acha or Acha no Tsubone (阿茶局, March 16, 1555 - February 16, 1637) was a Japanese noble woman from the Sengoku period to the early Edo period. She was a concubine of Tokugawa Ieyasu, the founder of the Tokugawa shogunate. Due to her intelligence, Ieyasu entrusted her with management of the family's affairs, sending her to negotiate peace during the Siege of Osaka. Her contributions to the stabilization of the Tokugawa shogunate and service to the country were notable for the court; being enducted to the Junior First Rank of the Imperial Court the second highest honor that could be conferred by the Emperor of Japan.