Regions of Papua New Guinea
- Sil
- Sikwong
- Sikur
- Sikukani
- Siktamin
- Siko Reef
- Sikor
- Sikku River
- Siki River
- Sikirari
- Sikikia
- Siki
- Sikeri
- Sikentika
- Sikel
- Sikam
- Sikaium
- Si-Ilugu Bay
- Sihan
- Sigul River
- Mount Sigul Mugal
- Sigule River
- Sigufe
- Sigon Mission
- Sigomi
- Sigiru
- Sigilwa
- Sigeiya
- Sigawa River
- Sigauga
- Sigari
- Sigan
- Sigaitei
- Sigabika
- Sigabaduru
- Siga
- Siemetamanabip
- Cape Siemens
- Sido Reef
- Sidney Islands
- Sidikilare
- Sidikeromo Creek
- Sid Creek
- Sidam
- Si Creek
- Sicacui Plantation
- Sicacui Harbour
- Sibuli River
- Siboitei
- Sibog
- Siblong River
- Siblong Plantation
- Sibium Mountains
- Sibitei
- Sibi River
- Sibi River
- Sibilanga Mission
- Sibil
- Sibieium
- Sibidiri
- Cape Sibida
- Sibia
- Sibede Creek
- Sibaure
- Sibaku
- Sibagaulum
- Sibabaru
- Siba
- Siawiti
- Siaute
- Siata Island
- Siassi Islands
- Siassi
- Siar River
- Siar Number 2
- Siar Number 1
- Siar Island
- Cape Siar
- Siar
- Siar
- Siapan
- Sianus
- Siang
- Siang
- Siamatai
- Siaman
- Siama
- Sialum Patrol Post
- Sialum Island
- Sialum
- Siaken
- Sia Islet
- Siri
- Siaga
- Siabe
- Sia
- Mount Shungol
- Shumbi
- Shuamosom
- Shoute Point
- Shoulder Hill
- Mount Shoppe
- Shon’hau
- Shiar
- Sherburne Reef
- Mount Shera
- Shepparton Shoal
- Shelter
- Shauwer
- Sharp Island
- Sham
- Shallow Bay
- Shagur
- Shaggy Ridge
- Seymour Bay
- Sey Creek
- Sewerimabu
- Sewe
- Sewataitai
- Sewason Plantation
- Sewason
- Sewa
- Sevuia Creek
- Sevoi
- Severisa
- Sevenbuk
- Seuwa Creek
- Seure
- Setwi
- Setavi
- Sesegara River
- Sesani
- Sesaburumu
- Mount Service
- Serra River
- Serra Hills
- Serra Headlands
- Sernion
- Serki
- Ser Island
- Seri Seri Creek
- Seri Point
- Serino
- Seringo
- Serimbinbonam
- Seriang
- Sereri Creek
- Sererian
- Serepo
- Serenguna
- Serandu
- Seran
- Seraminag
- Serai
- Seragonde
- Seragi Plantation
- Seragakim 2
- Seragakim 1
- Seraba
- Sepulchre Rock
- Sepu
- Sepsep Island
- Sepoi
- Sepik Wahgi Divide
- Sepik Rice Research Station
- Sepi
- Sepen Number 2
- Sepen Number 1
- Sepenbak Island
- Separa
- Sepa
- Senu River
- Senunu
- Sentinel Island
- Senta Passage
- Senta Bay
- Mount Seno
- Senimi River
- Seng River
- Sengri
- Sengo 2
- Sengo 1
- Sengoro
- Sengo
- Sengi Number 2 River
- Sengi Number 1 River
- Sengi
- Sengi
- Senga River
- Sengalem Creek
- Mount Senfft
- Senemsi
- Senemaka
- Senel
- Senekaul
- Senei
- Senau Creek
- Sena River
- Senani
- Cape Senang