- Radjah Shelduck
- Razorbill
- Red-backed Shrike
- Red-billed Chough
- Red-breasted Meadowlark
- Red-breasted Merganser
- Red-breasted Nuthatch
- Red-crested Pochard
- Red-crested Turaco
- Red-crowned Amazon
- Red-crowned Woodpecker
- Red-eyed Vireo
- Red-footed Falcon
- Red-legged Honeycreeper
- Red-legged Partridge
- Red-lored Amazon
- Red-necked Grebe
- Red-necked Phalarope
- Red-rumped Parrot
- Red-rumped Swallow
- Red-tailed Hawk
- Red-throated Loon
- Red-throated Pipit
- Red-vented Bulbul
- Red-wattled Lapwing
- Red-whiskered Bulbul
- Red-winged Blackbird
- Red Crossbill
- Red Fody
- Red Kite
- Red Knot
- Red Phalarope
- Redhead
- Redwing
- Resplendent Quetzal
- Reunion Bulbul
- Reunion Grey White-eye
- Reunion Harrier
- Reunion Olive White-eye
- Reunion Stonechat
- Ring-billed Gull
- Ringed Kingfisher
- Ringed Teal
- Rivoli's Hummingbird
- Roadside Hawk
- Rock Bunting
- Rock Dove
- Rock Ptarmigan
- Rock Sparrow
- Rook
- Rose-breasted Grosbeak
- Roseate Spoonbill
- Ross's Goose
- Ross's Turaco
- Rosy-billed Pochard
- Rosy Starling
- Ruby-throated Hummingbird
- Ruddy-breasted Seedeater
- Ruddy-capped Nightingale-Thrush
- Ruddy Ground Dove
- Ruddy Shelduck
- Ruddy Turnstone
- Ruff
- Ruffed Grouse
- Rufous-collared Sparrow
- Rufous-tailed Hummingbird
- Rufous-tailed Scrub Robin
- Rufous Crab Hawk
- Rüppell's Vulture
- Rüppell's Warbler
- Rusty-margined Flycatcher