MPE (Multi-Programming Executive) is a discontinued business-oriented mainframe computer real-time operating system developed by Hewlett-Packard for their HP 3000 computers. While the HP 3000s were initially mini-mainframes, the final high-end systems supported 12 CPUs and over 2000 simultaneous users.

It runs on the HP 3000 family of computers, which originally used HP custom 16-bit stack architecture CISC CPUs and were later migrated to PA-RISC where the operating system was called MPE XL.

In 1983, the original version of MPE was written in a language called SPL (System Programming Language). MPE XL was written primarily in Pascal, with some assembly language and some of the old SPL code.

In 1992, the OS name was changed to MPE/iX to indicate Unix interoperability with the addition of POSIX compatibility. The discontinuance of the product line was announced in late 2001, with support from HP terminating at the end of 2010. A number of 3rd party companies still support both the hardware and software.

In 2002 HP released the last version MPE/iX 7.5.^[1]

Among others, MPE/iX supports the following list of common commands and programs.^[2]

• Allegro Consultants, Inc. Free HP 3000 Software, MPE Software Support
• Beechglen Development Inc. Archived 1996-12-27 at the Wayback Machine MPE Software Support
• HP MPE/iX homepage
• HP MPE/iX Command reference
• openMPE Archived 2018-08-23 at the Wayback Machine Advocates of continued MPE and IMAGE source code access beyond 2010

v t e Hewlett-Packard
HP Inc. Hewlett Packard Enterprise
Founders	Bill Hewlett David Packard
Directors	Marc Andreessen Mohamed M. Atalla Shumeet Banerji Raj Gupta Raymond J. Lane Ann Livermore Gary M. Reiner Patricia F. Russo (Chairwoman) Jim Skinner
Executive officers	Meg Whitman Todd Bradley Dave Donatelli Martin Fink Henry Gomez John Hinshaw Marty Homlish George Kadifa Tracy Keogh Cathie Lesjak Mike Nefkens Antonio Neri John F. Schultz Bill Veghte
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