Okada Domain
was a feudal domain under the Tokugawa shogunate of Edo period Japan, in what is now western Okayama Prefecture. It controlled a small portion of central Bitchū Province and was centered around Okada jin'ya in what is now the Mabi neighborhood of the city of Kurashiki, Okayama. It was ruled throughout its history by a branch of the Itō clan. The location of the jin'ya changed several times, and the domain as also known as  after one of these locations where it was sited in the Genroku period (1688-1704). It was dissolved in the abolition of the han system in 1871 and is now part of Okayama Prefecture.

History
Itō Nagazane, the founder of the domain, who was a descendant of Itō Sukechika, a late Heian period warlord from Izu Province. He served Toyotomi Hideyoshi and Toyotomi Hideyori, and remained a loyal vassal of the Toyotomi clan until the Siege of Osaka. However, before the 1600 Battle of Sekigahara, he is said to have reported to Tokugawa Ieyasu that Ishida Mitsunari had raised an army against him, and for this reason Ieyasu pardoned Itō Nagazane and his son after the fall of Osaka and end of the Toyotomi. In 1615, he was awarded 10,343 koku scattered across several provinces. He constructed a jin'ya in southern Bitchū Province, and became a daimyō.  His descendants ruled the domain until the abolition of the han system in 1871.

A notable event in the history of the domain was the  of 1718. During the tenure of the 5th daimyō, Itō Nagahiro, the domain "nationalized" Mount Ohira and Mount Haruyama in what is now part of Sōja, Okayama. Historically, local villagers had been permitted to gather lumber for building and firewood on these mountains, but the domain forbid entry and attempted to make a monopoly on wood. Four village headmen travelled to Edo to make a direct appeal to the  daimyō. As a result, the monopoly was cancelled and the villagers had their traditional rights restored. However, as was the custom of the time, the four headmen were executed for lèse-majesté, their property forfeited, and their families expelled from the domain. A large monument now commemorates the event.

Okada Domain became Okada Prefecture, and was incorporated into Okayama Prefecture via Fukatsu Prefecture and Oda Prefecture. The Itō clan was later granted the title of viscount under the kazoku peerage system.

Holdings at the end of the Edo period
As with most domains in the han system, Okada Domain consisted of several discontinuous territories calculated to provide the assigned kokudaka, based on periodic cadastral surveys and projected agricultural yields, g. 

Bitchū Province 
16 villages in Katō District
Mimasaka Province
1 village in Ikeda District
Kawachi Province
2 villages in Takayasu District
Settsu Province
1 village in Toyoshima District

List of daimyō 

{| class=wikitable
! #||Name || Tenure || Courtesy title || Court Rank || kokudaka
|-
|colspan=6|  Itō clan, 1615-1871 (Tozama)
|-
||1||Itō  Nagazane (伊東長実)||1615 - 1629||Tango-no-kami (丹後守)|| Junior 5th Rank, Lower Grade (従五位下)||10,343 koku 
|-
||2||Itō  Nagamasa (伊東長昌)||1629 - 1640||Wakasa-no-kami (若狭守)|| Junior 5th Rank, Lower Grade (従五位下)||10,343 koku 
|-
||3||Itō  Nagaharu (伊東長治)||1640 - 1658|| -unknown- || Junior 5th Rank, Lower Grade (従五位下)||10,343 koku 
|-
||4||Itō  Nagasada (伊東長貞)||1658 - 1693||Shinano-no-kami (信濃守)|| Junior 5th Rank, Lower Grade (従五位下)||10,343 koku 
|-
||5||Itō  Nagahira (伊東長救)||1693 - 1723||Harima-no-kami (播磨守)|| Junior 5th Rank, Lower Grade (従五位下)||10,343 koku 
|-
||6||Itō  Nagaoka (伊東長丘)||1723 - 1763||Izu-no-kami (伊豆守)|| Junior 5th Rank, Lower Grade (従五位下)||10,343 koku 
|-
||7||Itō  Nagatoshi (伊東長詮)||1763 - 1778||Izu-no-kami (伊豆守)|| Junior 5th Rank, Lower Grade (従五位下)||10,343 koku 
|-
||8||Itō  Nagatomo (伊東長寛)||1778 - 1850||Harima-no-kami (播磨守)|| Junior 5th Rank, Lower Grade (従五位下)||10,343 koku 
|-
||9||Itō  Nagayasu (伊東長裕)||1850 - 1860||Wakasa-no-kami (若狭守)|| Junior 5th Rank, Lower Grade (従五位下)||10,343 koku 
|-
||10||Itō  Nagatoshi (伊東長とし)||1860 - 1871||Harima-no-kami (播磨守)|| Junior 5th Rank, Lower Grade (従五位下)||10,343 koku 
|-
|}

See also

 List of Han
 Abolition of the han system

References 

Domains of Japan
History of Okayama Prefecture
Bitchū Province
Chūgoku region