I
- "Ike" – USS Dwight D. Eisenhower; based on nickname of namesake, Dwight D. Eisenhower
- "Ikeatraz" - USS Dwight D. Eisenhower; derogatory nickname given to those that served on board and had gotten in trouble in some way.
- "Indy" - USS Independence
- "Iron Duck" - HMS Iron Duke
- "Fighting I" - USS Intrepid
Read more about this topic: List Of Warships By Nickname