- Persona Non Grata , literally meaning "an unwelcome person", is a term used in diplomacy with a specialised and legally defined meaning.
- Portable Network Graphics , a bitmapped image format that employs lossless data compression.
- Papua New Guinea , a country in Oceania, occupying the eastern half of the island of New Guinea and numerous off-shore islands.
- Pawnee National Grassland , a United States National Grassland located in northeastern Colorado on the Colorado Eastern Plains.
- Penang , an island in the Straits of Malacca, and also of one of the states of Malaysia.
- Professional Numismatists Guild
- Pack 'n' Go
- Passive Night Goggles , an optical instrument that allows images to be produced in levels of light approaching total darkness
- PnG can also stand for Procter And Gamble , an American global corporation based in Cincinnati, Ohio.
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