The Organiser Programming Language (OPL) is a common embedded system programming language for portable devices such as Personal digital assistant. Source code written in OPL can be compiled for several Psion devices, including the PSION Psion 3, Psion 5, Psion 7, and the PSION WorkAbout. The first implementation (without graphics) was for the Psion Organiser II (1986).

OPL is a structured programming language. Example:

PROC test: print Test pause 80 ENDP

OPL includes easy access to graphical functions, menus and other GUI elements.

After Psion retired from the PDA market, the project was resumed as Open Source and the Acronym was reinterpreted as Open Programming Language. Developement continues on SourceForge by the opl-dev project.

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