Abe Tadaaki (?? ??, September 4, 1602 – June 25, 1671) was a high-ranking government official in Japan under Tokugawa Iemitsu and Ietsuna, the third and fourth Tokugawa Shogun.
As the daimyo of the Oshi Domain in modern-day Saitama Prefecture, with an income of 80,000 koku (earlier 50,000), Abe was appointed wakadoshiyori (junior councillor) in 1633, and roju (Elder Councillor) shortly afterwards.
Iemitsu died in 1651 and was succeeded by his ten-year-old son Ietsuna.
While other government ministers reacted to the uprising with the instinctive desire to expel all ronin from Edo (the shogunal capital; today Tokyo), Abe thought it more pertinent to take a somewhat softer tack, aiding the ronin in seeking legitimate employment, and thus drastically reducing the number who would have reason to take up arms against the shogunate.
Several years before Tadaaki's death in 1671, Sakai Tadakiyo was appointed head of the council of roju; Tadaaki constantly rebuked Sakai for his poor sense of proper policy, and his laidback nature.
He accused Sakai of taking bribes, and of handling situations on a case-by-case basis, without any sense of overall policy or progress towards a goal.
Nevertheless, after thirty-eight years of loyal service to the shogunate, Tadaaki died at the old age of 69, leaving the government in the hands of the likes of those whose policies (or dire lack thereof) would lead over the course of several decades to the Genroku period (1688–1704), which saw a peak in corruption, hedonism, and wastefulness.