DR-DOS（Digital Research-Disk Operating System）是数字研究公司（Digital Research，很多人都和迪吉多（Digital Equipment Corporation, DEC）混淆，其实两家公司完全没有关系）开发的，最初用于个人电脑上的一种DOS操作系统。主要支持IBM PC兼容机。

从1990年代PC机广泛使用Windows 3.x开始，DR-DOS系统被逐步被MS-DOS取代。到1995年全面采用Windows 95时，DOS的影响开始减小，DR-DOS也随之在桌面市场迅速衰落。1999年，DR-DOS推出7.03版本，随后在一段时间内一直未有正式更新。目前DR-DOS在单任务嵌入式设备中还有少量应用，另有极少数DOS爱好者还在研究或使用DR-DOS。

DR-DOS (DR DOS, without hyphen up to and including v6.0) is an operating system of the DOS family, written for IBM PC-compatible personal computers. It was originally developed by Gary Kildall's Digital Research and derived from Concurrent PC DOS 6.0, which was an advanced successor of CP/M-86. As ownership changed, various later versions were produced as Novell DOS, Caldera OpenDOS, etc.