| 555 | Karon | Wilson (1961) | Free |
| 406 | Kawaiisu | Zigmond et al. (1990) | Free |
| 4 | Kayardild | Evans (1995) | Free |
| 379 | Kele | Lynch et al. (2002) | Free |
| 380 | Kele | Lynch et al. (2002) | Bound |
| 624 | Kemedzung | Smoes (2010) | Free |
| 650 | Keo (Udiworowatu Dialect) | Baird (2002) | |
| 412 | Ket | Georg (2006) | Free |
| 411 | Kham (Western Parbate) (Takale Dialect) | Watters (2002) | Free |
| 331 | Khmer (Central Dialect) | Haiman (2011) | Free |
| 354 | Kimaghima | Boelaars (1950) | Free |
| 401 | Kiowa | Adger et al. (2008) | Free |
| 263 | Kiwai, Northeast | Brown (2009) | |
| 264 | Kiwai, Southern | Ray (1907) | |
| 85 | Klon | Baird (2008) | |
| 209 | Klon: clean | Baird (2008) | |
| 297 | Koasati | Kimball (1991) | Free |
| 212 | Kobon: clean | Davies (1981) | Free |
| 127 | Kobon | Davies (1981) | Free |
| 186 | Kodeoha | Mead (1999) | |
| 265 | Koitabu | Dutton (1975) | Free |
| 253 | Kokoda | de Vries (2004) | |
| 398 | Kokota | Palmer (2009) | Bound |
| 590 | Kolbila | Littig (2009) | Free |
| 148 | Kombai | de Vries (1993) | |
| 228 | Kombio | Henry (1992) | |
| 29 | Komnzo | Döhler (2016) | |
| 600 | Konni | Cahill (1999) | Free |
| 553 | Konyagi | Wilson (2007) | Free |
| 461 | Koromfe | Rennison (1997) | Free |
| 233 | Koromira | Rausch (1912) | |
| 213 | Korowai: clean | van Enk and de Vries (1997) | |
| 124 | Korowai | van Enk and de Vries (1997) | |
| 513 | Kotiria | Waltz and Waltz (2000) | |
| 322 | Koya | Tyler (1969) | |
| 116 | Kristang | Baxter (1988) | Free |
| 578 | Krobu | Mensah (1983) | Free |
| 97 | Kuku Yalanji | Patz (2002) | Free |
| 609 | Kulango, Bouna | Elders (2008) | Free |
| 260 | Kunimaipa | Geary (1977) | |
| 31 | Kunja / Bondobol | Doehler spreadsheet | |
| 556 | Kupang Malay | Jacob and Grimes (2006) | Free |
| 276 | Kurtöp | Hyslop (2014) | |
| 319 | Kurukh | Hahn (1911) | |
| 694 | Kuuk Thaayorre | Gaby (2006) | Free |
| 696 | Kuuku Ya'u | Thompson (1988) | Free |
| 547 | Kuwaataay (Diembering Dialect) | Wilson (2007) | Free |
| 440 | Kwamera | Lindstrom and Lynch (1994) | Free |
| 621 | Kwanja (Njanga Dialect) | Robson (2011) | Free |
| 316 | Kwaza | van der Voort (2004) | Free |
