Toyotomi Hidetsugu (豊臣 秀次?, 1568 – July 15, 1595) was a nephew and retainer of Toyotomi Hideyoshi who lived during the Sengoku period of the 16th century of Japan.
A practitioner of the shudō tradition, Hidetsugu had a number of wakashū. Among these were Yamamoto Tonoma, Yamada Sanjuro, and his most beloved, Fuwano Mansaku (also Bansaku), who gained lasting renown for his beauty of body and spirit.
Hidetsugu was born to Hideyoshi's elder sister, but adopted by the Miyoshi clan and given the name Miyoshi Nobuyoshi. He later renamed himself Hashiba Hidetsugu, in honor of his famous uncle: "Hashiba" was the Hideyoshi's family name, and "Hidetsugu" can be translated as "next Hide".
After the Incident at Honnō-ji in 1582, Hidetsugu was given a 400 thousand koku fiefdom in Ōmi Province because he was one of Hideyoshi's few relatives. In his subsequent career as a general, he sustained heavy losses in the Battle of Nagakute against Tokugawa Ieyasu, but he proved himself in Hideyoshi's Invasion of Shikoku and Siege of Odawara. He also proved a competent manager of the castle town of Ōmihachiman.
In 1590, (Tenshō 18), he was appointed castellan of Kiyosu Castle in Owari Province, where Oda Nobukatsu had once ruled. The following year, Hideyoshi lost his legitimate heir Tsurumatsu (who died before adulthood) and so gave Hidetsugu the position of Imperial Regent. This meant Hidetsugu had to move to Jurakudai in Kyoto, and resulted in a so-called "dual system of government" (二元政治) run by Hideyoshi and Hidetsugu, with the assumption that latter would succeed the former after his death. As Hideyoshi was busy handling the invasion of Korea, Hidetsugu acted in his place to handle domestic affairs.