Science magazines
- Illinois Cave Amphipod
- Imperial Woodpecker
- Independence Valley Speckled Dace
- Indian Knob Mountainbalm
- Indiana Bat
- Inyo California Towhee
- Ione Buckwheat
- Ione Manzanita
- Iowa Pleistocene Snail
- Island Barberry
- Island Bedstraw
- Island Malacothrix
- Island Night Lizard
- Island Phacelia
- Island Rush-rose
- Ivory-billed Woodpecker
- James River Spinymussel
- Jesup's Milk-vetch
- Johnson's Seagrass
- Johnston's Frankenia