I/O (disambiguation)

I/O may refer to:
 * Input/output, a system of communication for information processing systems
 * Input–output model, an economic model of flow prediction between sectors
 * Industrial and organizational psychology, the field of psychology that studies the workplace
 * Industrial organization, the field of economics that studies the behavior of firms
 * i/o (album), an album by Peter Gabriel (2023)
 * "i/o" (song), song by Peter Gabriel (2023)
 * Input/Output (EP), a 2003 EP by The Letterpress
 * I/O (visual novel), a Japanese science fiction visual novel by Regista
 * I/O, a 2004 album by the Canadian rock band Limblifter
 * I/O model, a model of computation
 * Input/Output a contemporary Christian children's song on the 1984 Bill Gaither Trio LP entitled (Ten New Songs With Kids...For Kids About) Life
 * IEC 60417 symbols for power delivery or device activation