Solaris Operating Environment (OE), usually just referred to as Solaris, is the name of a computer operating system by Sun Microsystems. It is a UNIX dialect.

Early versions, based on BSD UNIX, were called SunOS. The shift to a System V code base in SunOS 5 was marked by changing the name to Solaris 2 (and earlier versions were retroactively named Solaris 1.x). After version 2.6, Sun began to drop the "2." from the name; the most recent versions (as of early 2002) are Solaris 7 and the 64-bit Solaris 8. Solaris 9 was released 22 May 2002.

Solaris is primarily written to run on Sun SPARC processors. There is also a version called Solaris-x86 that runs on PCss. Solaris 10 is expected to also be available for the AMD64.

Solaris is proprietary rather than open source, but both binary and source versions have been freely downloadable at various times.

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