唯读记忆光盘（Compact Disc Read-Only Memory，缩写：CD-ROM），是一种在电脑上使用的光盘。这种光盘只能写入数据一次，信息将永久保存在光盘上，使用时通过光盘驱动器读出信息。CD的格式最初是为音乐的存储和回放设计的，1985年，由SONY和飞利浦制定的黄皮书标准使得这种格式能够适应各种二进制数据。

增强型CD既存储音乐，又存储计算机数据；这种CD-ROM的音乐能够被CD播放器播放，计算机数据只能被计算机处理。

A CD-ROM /ˌsiːˌdiːˈrɒm/ is a pre-pressed optical compact disc which contains data. The name is an acronym which stands for "Compact Disc Read-Only Memory". Computers can read CD-ROMs, but cannot write to CD-ROMs which are not writable or erasable.

Until the mid-2000s, CD-ROMs were popularly used to distribute software for computers and video game consoles. Some CDs, called enhanced CDs, hold both computer data and audio with the latter capable of being played on a CD player, while data (such as software or digital video) is only usable on a computer (such as ISO 9660 format PC CD-ROMs).