Nios or NIOS may refer to:
Places Ios or Nios, a Greek island
Computing Network I/O System, Digital Research's NIOS component in CP/NET in the 1980s NetWare I/O Subsystem, Novell's NIOS component in the 32-bit network clients in the mid-1990s Nios embedded processor, Altera 16-bit embedded processor Nios II, Altera 32-bit embedded processor
Other uses National Institute of Open Schooling, the board of education in India Hyundai Grand i10 Nios, a 2019–present Korean-Indian city car
See also NetBIOS Lake Nyos, a crater lake in Cameroon NIO (disambiguation), for the singular of NIOs