COSIX

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| name = COSIX

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| developer = China National Computer Software & Technology Service Corporation (CS&S), Compaq

| family = Unix (Tru64)

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| released = {{Start date and age|1989}}

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COSIX is a Chinese UNIX operating system developed since 1989 by China National Computer Software & Technology Service Corporation (CS&S). A jointly developed 64-bit version with Compaq was released in 1999.

An early version of the COSIX kernel was developed based on UNIX System V,{{cite journal|last=刘启原|title=国产操作系统COSIX|journal=软件世界| date=January 1995 }} and the 64-bit version was based on Tru64 UNIX.{{cite web|title=China National Computer Software & Technology Service Corporation Chooses Compaq's Digital UNIX Technology as Basis for China's 64-Bit UNIX|url=http://findarticles.com/p/articles/mi_m0EIN/is_1998_Sept_10/ai_50298501/|work=INTERACTIVE BUSINESS NETWORK RESOURCE LIBRARY |date=1998-09-10|accessdate=2011-09-26}} A Linux distribution named COSIX Linux was developed by CS&S and released in 1999, which had no technical relationship to COSIX.