Operador Nacional do Sistema Elétrico (Brazil, ons.org.br)

Office National de la Statistique (Mauritania, ons.mr)

Office for National Statistics, UK

Onslaught, an Unreal Tournament 2004 gametype

One-name study, the study of a single surname

(WWE) One Night Stand

One-night stand

Object Naming Service

Office National des Statistiques de l'Algérie (ons.dz)

The Ons Island in Galicia, Spain.

Oberste Nationale Sportbehörde, former German motor racing governing body, now Deutscher Motor Sport Bund (DMSB)

Order of Nova Scotia (Canadian decoration post-nominal letters)

Old North State Council of the Boy Scouts of America