- Kagu
- Kalij Pheasant
- Kandt's Waxbill
- Karoo Chat
- Karoo Eremomela
- Karoo Lark
- Karoo Prinia
- Karoo Scrub Robin
- Karoo Thrush
- Kea
- Keel-billed Toucan
- Kelp Goose
- Kelp Gull
- Kemp's Longbill
- Kentish Plover
- Kentucky Warbler
- Kikuyu Mountain Greenbul
- Killdeer
- King Bird-of-paradise
- King Eider
- King of Saxony Bird-of-paradise
- King Quail
- King Vulture
- Kittlitz's Plover
- Klaas's Cuckoo
- Knob-billed Duck
- Knob-billed Fruit Dove
- Knobbed Hornbill
- Knysna Turaco
- Kori Bustard
- Kurrichane Thrush