- F-winged Barklouse
- Faint-spotted Palthis Moth
- Fairy-ring Longhorn Beetle
- Fall Armyworm Moth
- Fall Webworm Moth
- False Black Widow
- False Milkweed Bug
- False Potato Beetle
- Familiar Bluet
- Fencepost jumping spider
- Ferruginous Carpenter Ant
- Ferruginous Hawk
- Ferruginous Pygmy-Owl
- Ferruginous Tiger Crane Fly
- Field Crescent
- Field Sparrow
- Fieldfare
- Fiery Searcher
- Fiery Skimmer
- Fiery Skipper
- Figeater Beetle
- Filbertworm Moth
- Filmy Dome Spider
- Fir Tussock Moth
- Fire Salamander
- Fish Crow
- Flame Shoulder Moth
- Flame Skimmer
- Flame-shouldered Dart
- Flap-necked Chameleon
- Flat-tailed House Gecko
- Flea jumping spider
- Florida Carpenter Ant
- Florida Red-bellied Cooter
- Florida Softshell Turtle
- Flounced Rustic
- Forest Bug
- Forest Tent Caterpillar Moth
- Fork-tailed Bush Katydid
- Fork-tailed Flycatcher
- Forster's Tern
- Four-banded longhorn beetle
- Four-banded Stink Bug Wasp
- Four-lined Plant Bug
- Four-speckled Hover Fly
- Four-spot Orbweaver
- Four-spotted Footman
- Four-spotted Moth
- Four-spotted Pennant
- Four-spotted Skimmer
- Four-toothed Mason Wasp
- Fourteen-spotted Lady Beetle
- Fowler's Toad
- Fox Moth
- Fox Sparrow
- Fragile Forktail
- Franklin's Gull
- Fraternal Potter Wasp
- Frilled Dogwinkle
- Fulvous Whistling-Duck
- Funereal Duskywing
- Fungus-eating ladybird
- Furrow Orbweaver
- Fuzzy-Horned Bumble Bee