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