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S/PDIF (Sony/Philips Digital Interface Format) is a type of digital audio transfer file format developed primarily by Sony and Philips. It enables the transfer of digital audio without converting it to and from analog, which can degrade the signal.

S/PDIF is typically used to connect consumer audio equipment over short distances. The connector is found on equipment such as a DAT (Digital Audio Tape) device, home theater amplifiers, etc. S/PDIF is based on the professional AES3 interconnect standard.

S/PDIF signals are carried over two types of cables. The first is a 75-ohm coaxial cable with orange RCA connectors. The second is a fiber cable with TOSLINK connectors.