FF, Ff, or ff may refer to:
FFmpeg is a free software project that produces libraries and programs for handling multimedia data. FFmpeg includes libavcodec, an audio/video codec library used by several other projects, libavformat (Lavf), an audio/video container mux and demux library, and the ffmpeg command line program for transcoding multimedia files.
The Ffestiniog Railway (Welsh: Rheilffordd Ffestiniog) is a 1 ft 11 1⁄2 in (597 mm) narrow gauge heritage railway, located in Gwynedd, Wales.
The Football Federation Australia Cup, commonly known as the FFA Cup, is the main national soccer knockout cup competition in Australia.
FFS is the debut studio album by supergroup FFS, consisting of members from the Scottish band Franz Ferdinand and the American band Sparks.
FFV1, which stands for "FF video codec 1", is a lossless intra-frame video codec. It can use either variable length coding or arithmetic coding for entropy coding.
A Fixed-Field Alternating Gradient accelerator (FFAG) is a circular particle accelerator concept on which development was started in the early 50s, and that can be characterized by its time-independent magnetic fields (fixed-field, like in a cyclotron) and the use of strong focusing (alternating gradient, like in a synchrotron).
FFS (an abbreviation of Franz Ferdinand and Sparks) is a supergroup formed by Scottish indie rock band Franz Ferdinand and American rock-pop band Sparks, signed to the Domino Recording Company.
The Ffos Las racecourse (strictly: Ffos Las Racecourse & Conference Centre) is a British horse racing, equestrian sports and conferencing venue situated in Ffos Las, Wales.
The FFA Centre of Excellence (formerly the Australian Institute of Sport Football Program) is a football talent identification and player development program run by Football Federation Australia and is based at the Australian Institute of Sport, in Canberra.