| Name | Explanation | Examples |
|---|---|---|
| I | Fighter Istrebitel |
I-16, I-63 |
| IAD | Fighter Aircraft Division, Istrebitelnyj AviaDivizia | |
| IAP | Fighter Aircraft Regiment, Istrebitelnyj AviaPolk | |
| IAPO, IAPA, ÈÀÏÎ | Irkutskoe AviaPromyshlennoe Ob'edinenie Irkutsk Aircraft Production Association |
see IAPO page |
| ICBM | InterContinental Ballistic Missile | |
| Il | Initials of Ilyushin Design Bureau; | Il-2, Il-28, Il-76 |
| IL | Istrebitel, - Liberty or, Fighter with "Liberty" engine; | IL-3 |
| Il-KU | Family of tail gun installation, used on Ilyushin Aircraft Ilyushin - Kormovaja Ustanovka | Il-22 page |
| IP | Cannon armed Fighter, Istrebitel Pushechnij | IP-1, IP-4; |
| IS | Folding Fighter, Istrebitel Skladnoj | IS-1, IS-2, IS-4; |
| IS | Joseph Stalin (or Fighter by Silvansky), Iosif Stalin (or Istrebitel Silvanskogo) | IS |
| ITP | Heavy Cannon armed Fighter, Istrebitel Tiajolij Pushechnij | ITP |
| IVF | Institute for the Air Fleet, Institute Vozdushnogo Flota | mentioned on K.A.Kalinin page; |
| I-Z | Help ! | IZ |