PG: An MPAA (US) movie rating

Perth Glory FC, an Australian football (soccer) club

the Proto-Germanic language

A BBFC (UK) film, home video, or computer games rating

Prince George's County, Maryland

Procter & Gamble, a consumer goods company

Professional Gamer, one who makes a living from playing electronic sports

PG, one of the grades used in the Gunpla grading system.

PostgreSQL, a popular database system

Project Gutenberg

Prostaglandin, a hormone.

Persian Gulf

An OFLC (Australia) movie rating

plasma gun

Postgraduate (Education)

page

Professional Geologist

Point guard, one of the five positions in a basketball lineup

Page, in chat short-hand

Punta Gorda, Belize

Patrologia Graeca: A collection of writings by the Christian Church Fathers in the Greek language

Bangkok Airways: IATA airline designator

Papua New Guinea: ISO 3166-1 country code

Paul Gilbert, an American guitarist

PG Tips, a brand of tea

Physical Graffiti, an album by Led Zeppelin

Pinot Grigio, a wine

Prince George, British Columbia

Spratly Islands: FIPS PUB 10-4 territory code

petagram, an SI unit of mass (10¹⁵ grams)

Papua New Guinea: .pg is its Internet country code top-level domain (ccTLD)

picogram, an SI unit of mass (10^-12 gram)

pg, a Unix system command