DOS 2 or DOS-2 may refer to:
A failed Soviet space station DOS-2, part of the Salyut programme Atari DOS 2.0 for Atari 8-bit computers
It may also refer to versions of the Microsoft MS-DOS family: MS-DOS 2.00, Microsoft (internal) version in 1982 and 1983, successor of MS-DOS 1.xx, licensed to various OEMs including IBM MS-DOS 2.01, Microsoft (internal) version in 1983 MS-DOS 2.10, Microsoft (internal) version in 1983 MS-DOS 2.11, Microsoft (internal) version in 1983 MS-DOS 2.11R, a ROMed version for Tandy PCs in 1988 MS-DOS 2.12, a special OEM version for the TI Professional in 1983/1984 MS-DOS 2.25, Microsoft version with extended multilanguage support in 1985
It may also refer to versions of the IBM PC DOS family: PC DOS 2.0, successor of PC DOS 1.1 in 1983 PC DOS 2.1, successor of PC DOS 2.0 in 1983 PC DOS 2.11, successor of PC DOS 2.1 in 1984
It may also refer to operating systems of the Digital Research family: DOS Plus 1.0, a single-user variant of Concurrent PC DOS in 1985 DOS Plus 1.1, a single-user variant of Concurrent PC DOS in 1985 DOS Plus 1.2, a single-user variant of Concurrent PC DOS 4.1 in 1986 DOS Plus 2.1, a single-user variant of Concurrent PC DOS 5.0 in 1988
See also DOS (disambiguation) DOS 1 (disambiguation) DOS 3 (disambiguation) DOS 20 (disambiguation) DOS 286 (disambiguation)