| owi | owin1240 | Owiniga | Left May | 308 |
| ury | orya1242 | Orya | Tor-Orya | 307 |
| oro | orok1267 | Orokolo | E,
Western Eleman | 112 |
| oro | orok1267 | Orokolo (Kaipi Dialect) | E,
Western Eleman | 113 |
| okv | orok1269 | Orokaiva (Sairope Dialect) | N,
G,
B,
N,
S,
Orokaivic | 83 |
| okv | orok1269 | Orokaiva (Kendata Dialect) | N,
G,
B,
N,
S,
Orokaivic | 87 |
| okv | orok1269 | Orokaiva (Jegarata-Kakendetta Dialect) | N,
G,
B,
N,
S,
Orokaivic | 91 |
| okv | orok1269 | Orokaiva (Para Harava Dialect) | N,
G,
B,
N,
S,
Orokaivic | 80 |
| okv | orok1269 | Orokaiva (Sose Dialect) | N,
G,
B,
N,
S,
Orokaivic | 400 |
| okv | orok1269 | Orokaiva (Dobuduru Dialect) | N,
G,
B,
N,
S,
Orokaivic | 204 |
| okv | orok1269 | Orokaiva (Jegasa-Sarau Dialect) | N,
G,
B,
N,
S,
Orokaivic | 123 |
| okv | orok1269 | Orokaiva | N,
G,
B,
N,
S,
Orokaivic | 93 |
| okv | orok1269 | Orokaiva (Waseda Dialect) | N,
G,
B,
N,
S,
Orokaivic | 0 |
| orz | ormu1248 | Ormu | A,
M,
E,
O,
W,
N,
S,
Jayapura Bay | 21 |
| opo | opao1240 | Opao | E,
Western Eleman | 104 |
| ons | onoo1246 | Ono (Kip Dialect) | N,
F,
H,
E,
Kalasa | 59 |
| ons | onoo1246 | Ono (Zankoa Dialect) | N,
F,
H,
E,
Kalasa | 14 |
| ons | onoo1246 | Ono | N,
F,
H,
E,
Kalasa | 140 |
| ons | onoo1246 | Ono (Karako Dialect) | N,
F,
H,
E,
Kalasa | 12 |
| oni | onin1245 | Onin | A,
M,
T,
N,
Y,
Oninic | 10 |
| oin | ineb1235 | One, Inebu | N,
W,
O,
Central-Northern One | 46 |
| onn | onob1238 | Onabasulu | B,
Bosavi Watershed | 197 |
| jmw | mouw1234 | Omati | T,
Turama-Omatian | 97 |
| ong | oloo1241 | Olo | N,
W,
C,
W,
A,
Olo-Elkei | 46 |
| opm | oksa1245 | Oksapmin (Upper Dialect) | N,
A,
A,
Ok-Oksapmin | 30 |
| opm | oksa1245 | Oksapmin (Lower Dialect) | N,
A,
A,
Ok-Oksapmin | 95 |
| oia | oira1263 | Oirata | T,
E,
Fataluku-Oirata | 233 |
| eri | ogea1238 | Ogea | N,
M,
R,
Nuru | 346 |
| kkc | odoo1238 | Odoodee (Kalamo Dialect) | East Strickland | 99 |
| kkc | odoo1238 | Odoodee (Hesif Dialect) | East Strickland | 94 |
| bhf | odia1239 | Odiai | Isolate | 88 |
| afz | obok1239 | Obokuitai | L,
T,
E,
Eritai-Obokuitai-Biritai | 262 |
