FSSP

FSSP may refer to:


 * Families of structurally similar proteins, a protein structures database
 * Federal Bailiffs Service (Russia), abbreviated FSSP in Russian
 * Firing squad synchronization problem, a problem in computer science and cellular automata
 * Frances Slocum State Park, a state park in Luzerne County, Pennsylvania
 * Priestly Fraternity of Saint Peter, a society of traditionalist Catholic priests and seminarians
 * Fresh Start Schools Programme, a programme for schools in South Africa
 * 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)