1. PQ - Noun
2. PQ - Proper noun
(chemistry) Initialism of plastoquinone.
(electronics) Initialism of picture quality.
Initialism of power quality.
(Canadian politics) Initialism of Parti Québécois - a political party of the province of Quebec, Canada
(dated, Canada) Initialism of Province of Quebec- in Canada
Source: en.wiktionary.org