C++ FAQ Celebrating Twenty-One Years of the C++ FAQ!!!
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Section 6:
[6.12] Is C++ standardized? Updated!
[Recently changed to reflect the C++11 standard, which was ratified August 2011. Click here to go to the next FAQ in the "chain" of recent changes]

Yes.

The C++ standard was finalized and adopted by ISO (International Organization for Standardization) as well as several national standards organizations such as ANSI (The American National Standards Institute), BSI (The British Standards Institute), DIN (The German National Standards Organization). The ISO standard was finalized and adopted by unanimous vote November 1997, with minor updates in 2003 and now significant and valuable updates in 2011.

The ANSI C++ committee is called "X3J16". The ISO C++ standards group is called "WG21". The major players in the ANSI/ISO C++ standards process include just about everyone: representatives from Australia, Canada, Denmark, France, Germany, Ireland, Japan, the Netherlands, New Zealand, Sweden, the UK, and the USA, along with representatives from about a hundred companies and many interested individuals. Major players include AT&T, Ericsson, Digital, Borland, Hewlett Packard, IBM, Mentor Graphics, Microsoft, Silicon Graphics, Sun Microsystems, and Siemens.