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The '''PL/I preprocessor''' is the [[preprocessor]] for the [[PL/I]] computer [[programming language]]. The preprocessor interprets a subset of the full PL/I language to perform [[source file]] inclusion, [[conditional compilation]], and [[Macro (computer science)|macro expansion]].
The preprocessor language has a PL/I-like syntax with preprocessor statements and preprocessor procedures prefixed with a [[percent sign|percent symbol]] (%). Listing-control statements, which supply formatting commands for the [[compiler]] listing, are usually considered preprocessor statements and also begin with '%'. Preprocessor statements are imbedded in and operate on input text. The input text is normally a PL/I program, but is agnostic to the grammar of PL/I, so the preprocessor can also be used independently to process other kinds of text files.
The preprocessor is not specified as part of standard PL/I, but most PL/I implementations accept the language of the IBM preprocessor.
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