I
- Isabella Stewart Gardner Museum. (2)
- Isaiah (Biblical prophet) (1)
- Iseult (Yacht) (1)
- Ishpeming (Freighter) (4)
- Isla de Luzon (Gunboat) (1)
- Island Queen (Side wheeler) (1)
- Islander (Steamboat) (4)
- Islands. (237)
- Isolde (Yacht) (1)
- Italian Americans--Employment. (1)
- Italian Americans. (3)
- Italy--Capri Island. (2)
- Italy--Matterhorn. (2)
- Italy--Milan. (1)
- Italy--Pontine Marshes. (1)
- Italy--Venice. (10)
- Ituna (Steam yacht) (2)
- Ivanhoe (Schooner) (2)
- Izard, Alice de Lancey,--d. 1832. (1)
- Izard, Ralph,--1741-1804. (1)