Saga Domain (佐賀藩, Saga-han), also known as Hizen Domain (肥前藩, Hizen-han), was a Japanese domain in the Edo period. It is associated with Hizen Province in modern-day Saga Prefecture on the island of Kyushu. In the han system, Saga was a political and economic abstraction based on periodic cadastral surveys and projected agricultural yields. In other words, the domain was defined in terms of expected value of tax revenue (kokudaka), not land area. This was different from the feudalism of the West.