The Institute of Yilan County History (IOYCH; traditional Chinese: 宜蘭縣史館; simplified Chinese: 宜兰县史馆; pinyin: Yílán Xiàn Shǐguǎn) is a local institute of history in Yilan City, Yilan County, Taiwan built to collect, access, record, research and promote the local history of Yilan County.

IOYCH was originally established on 1 January 1992 and was inaugurated on 16 October 1993.

[3] The institute exhibits collections pertaining the local history of Yilan and also genealogy and artifacts of the local population.

[4][5] The institute regularly holds exhibitions, symposiums, seminars and forums about the research of Yilan County.

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