S0

S0 may refer to:
 * S0 Truss, an element of the International Space Station
 * S0, elemental sulfur
 * IATA airline designator for Aerolíneas Sosa
 * Previously, IATA airline designator for Slok Air Gambia (disestablished)
 * the representation of the number 1 in Peano arithmetic
 * ACPI S0 power state in computing
 * S0 galaxy, an astronomical code for barless lenticular galaxy
 * S0, part of the name of certain stars within one arc-second of Sagittarius A*
 * S0 (DIN 43864), an output from electricity meters that give pulses proportional to the amount of consumed energy
 * the S0 interface bus used in ISDN BRI in telephony