DOS 286 or DOS/286 may refer to:
Concurrent DOS 286, a Digital Research CP/M- and DOS-compatible multiuser multitasking operating system variant since 1985 FlexOS 286, a Digital Research FlexOS operating system variant since 1986 OS/2 1.0, an IBM and Microsoft operating system and then-times supposed-to-be successor of MS-DOS/PC DOS since 1987
See also DOS 2 (disambiguation) DOS 5 (disambiguation) DOS 386 (disambiguation) DOS (disambiguation)