FSSP may refer to:
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Families of structurally similar proteins, a protein structures database
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Federal Bailiffs Service (Russia), abbreviated FSSP in Russian
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Firing squad synchronization problem, a problem in computer science and cellular automata
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Frances Slocum State Park, a state park in Luzerne County, Pennsylvania
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Priestly Fraternity of Saint Peter
The Priestly Fraternity of Saint Peter (; FSSP) is a traditionalist Catholic society of apostolic life for priests and seminarians. It is in communion with the Holy See. It was founded in 1988 by 12 former members of the Society of Saint Pius ...
, a society of traditionalist Catholic priests and seminarians
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Fresh Start Schools Programme, a programme for schools in South Africa
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Forward Scattering Spectrometer Probe, a class of optical instruments designed to measure size and concentration of particles suspended in the air (such as cloud droplets)
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