- Razorbill
- Red-bellied Woodpecker
- Red-breasted Merganser
- Red-breasted Nuthatch
- Red-crowned Woodpecker
- Red-eyed Vireo
- Red-headed Woodpecker
- Red-legged Honeycreeper
- Red-necked Grebe
- Red-shouldered Hawk
- Red-tailed Hawk
- Red-throated Loon
- Red-winged Blackbird
- Red Fox Sparrow
- Reddish Egret
- Redhead
- Resplendent Quetzal
- Ring-billed Gull
- Ring-necked Duck
- Rivoli's Hummingbird
- Rock Dove
- Rock Wren
- Rose-breasted Grosbeak
- Roseate Spoonbill
- Ross's Gull
- Royal Tern
- Ruby-crowned Kinglet
- Ruby-throated Hummingbird
- Ruddy-capped Nightingale-Thrush
- Ruddy Duck
- Ruddy Ground Dove
- Ruddy Treerunner
- Ruddy Turnstone
- Ruffed Grouse
- Rufous-collared Sparrow
- Rufous-tailed Hummingbird
- Rufous-winged Sparrow
- Rusty Blackbird