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.
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.
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.
Fame Fashion and Creative Excellence (FFACE) [pronounced | feɪs] is eastern India's prominent talent management brand.