IBM Engineering Requirements Management DOORS (Dynamic Object Oriented Requirements System) (formerly Telelogic DOORS, then Rational DOORS) is a requirements management tool. It is a client–server application, with a Windows-only client and servers for Linux, Windows, and Solaris. There is also a web client, DOORS Web Access.

IBM Engineering Requirements Management DOORS Family has its own programming language called DOORS eXtension Language (DXL).

IBM Engineering Requirements Management DOORS Next is now developed on the IBM Jazz platform. The Jazz platform uses Open Services for Lifecycle Collaboration (OSLC).

In order to complete its functionality, IBM Engineering Requirements Management DOORS Next has an open architecture that supports third-party plugins.

DOORS was originally published by Quality Systems and Software Ltd (QSS) in 1991. Telelogic acquired QSS in mid-2000 and IBM acquired Telelogic in 2008.

DOORS was created by Dr Richard Stevens, a researcher through the 1970s and 1980s at the European Space Agency's Research Institute (ESRIN). The first version was provided to the UK Ministry of Defence in 1991–2. The first commercial version was released in 1993.

DOORS is designed to ease the requirements management process with a variety of features: