ONS or Ons may refer to:

• ONS (TV channel), Netherlands and Belgium
• Ons Island, Spain
• Ons Jabeur, Tunisian tennis player
• Oberste Nationale Sportbehörde ('Supreme National Sports Authority'), German body now named Deutscher Motor Sport Bund
• Object Naming Service, similar to Domain Name Service (DNS)
• Occipital nerve stimulation, a medical treatment
• Office for National Statistics, UK
• National Office of Statistics (French: Office National des Statistiques), Algeria
• Oncology Nursing Society, U.S.
• One-night stand
• Onslow Airport (IATA code), Australia
• Order of Nova Scotia, a civilian honor
• Original Night Stalker, an American serial killer
• Oulu Nice Soccer, a football club in Finland