An Orange Book may refer to any of the following:
1. The U.S. Governments Department of Defense security evaluations (5200.28-STD) published in December 1985. Today, the Orange Book is considered obsolete and can be found online in the online Rainbow series listing.
2. The Orange Book is a book first released in 1989 by Philips and Sony that defines the standard for writable discs. In this book, you can find the standards for CD-MO, CD-R, CD-ROM, and CD-RW discs.