I9, i9 or I-9 may refer to:

Science and technology

  • Intel Core i9, a line of high-performance processors
  • Gulftown, microprocessors originally rumored to be called the Intel Core i9
  • Inline-nine engine, a straight engine with nine cylinders
  • ICD-9, a coding system for medical diagnoses and procedures

Other uses

  • Form I-9, a US Citizenship and Immigration Services form
  • Air Italy (2005–2018) (former IATA code: I9), a former Italian airline
  • Interstate 9, a proposed upgrade to California State Route 99
  • Skaraborg Regiment (infantry) (designation: I 9), a Swedish Army infantry regiment disbanded in 1942
  • Japanese submarine I-9, an Imperial Japanese Navy submarine

See also

  • I Nine, an American band
  • 9I (disambiguation)