• Occupational diseases
  • Occupational therapy (Daily structure for persons with disabilities)
  • Odd jobs (Casual work)
  • Offenders' assistance (Discharge from prison)
  • Office of inland revenue (Tax office)
  • Old age pension
  • Ombudsman public (Attorney of the people)
  • Online counselling
  • Optician
  • Organ donations
  • Organ transplants
  • Organ transplants self-help
  • Orphan's pension (Survivors' pension)
  • Orphan diseases (Rare diseases)
  • Orthopaedic aids (Technical aids for persons with physical disability)
  • Osteoporosis self-help
  • Over-night shelters (Emergency accommodation for homeless persons)
  • Oxygen service
  • Ozone (Air pollution)