- Razorbill
- Red-and-yellow Barbet
- Red-backed Shrike
- Red-billed Chough
- Red-billed Firefinch
- Red-billed Pigeon
- Red-billed Tropicbird
- Red-breasted Goose
- Red-breasted Merganser
- Red-cheeked Cordon-bleu
- Red-crested Pochard
- Red-flanked Bluetail
- Red-legged Honeycreeper
- Red-legged Partridge
- Red-lored Amazon
- Red-necked Falcon
- Red-necked Grebe
- Red-necked Phalarope
- Red-rumped Swallow
- Red-throated Ant Tanager
- Red-throated Loon
- Red-throated Pipit
- Red-vented Bulbul
- Red-wattled Lapwing
- Red Kite
- Red Knot
- Reddish Egret
- Redwing
- Resplendent Quetzal
- Ring-billed Gull
- Ring-necked Dove
- Ring Ouzel
- Rivoli's Hummingbird
- Roadside Hawk
- Rock Dove
- Rock Ptarmigan
- Rock Sparrow
- Rook
- Rose-ringed Parakeet
- Roseate Spoonbill
- Ross's Gull
- Royal Tern
- Ruddy Duck
- Ruddy Ground Dove
- Ruddy Turnstone
- Ruff
- Rufous-collared Sparrow
- Rufous-tailed Hummingbird
- Rufous-tailed Jacamar
- Rufous-tailed Weaver
- Rufous Motmot
- Rüppell's Starling