fpp or FPP may refer to one of many Fortran preprocessors:
A preprocessor written in FORTRAN 77 referred to in the paper fpp - A Fortran pre-processor by Adam Boyarski at the Stanford Linear Accelerator Center. This program was originally at
ftp://heplib.slac.stanford.edu/pub/fpp.tar.Z but is no longer available.
Nelson Beebe’s fpp, inspired by the C-preprocessor. Preprocessing directives are written as Fortran comments. All directives of cpp are supported, with the exception of #include.