The CD-i or Compact Disc Interactive is the name of an interactive multimedia CD player developed and marketed by Royal Philips Electronics N.V. CD-i also refers to the multimedia Compact Disc standard utilized by the CD-i console, also known as Green Book, which was co-developed by Philips and Sony in 1986. The first Philips CD-i player, released in 1991 and initially priced around USD $400, was capable of playing interactive CD-i discs, Audio CDs, CD+G (CD+Graphics), Karaoke CDs, and Video CDs (VCDs), though the last required an optional "Digital Video Card" to provide MPEG-1 decoding.

Early software releases in the CD-i format focused heavily on educational and self-improvement titles, with only a handful of video games, many of them adaptations of board games like "Connect Four". The most popular games for the system were The 7th Guest and Burn: Cycle. Later attempts to develop a foothold in the games market were rendered irrelevant by the arrival of cheaper and more powerful consoles, such as the Sony PlayStation. CD-i is noted for the release of several spinoffs of popular Nintendo video games featuring characters typically seen only on Nintendo consoles, although those games were not developed by Nintendo.