LSO may refer to: Computing Large segment offload, a technology for reducing CPU overhead Local shared object, an HTTP cookie-like data entity used by Adobe Flash Player Location search optimization, a web optimization method Organisations LSO (company), a delivery company formerly known as Lonestar Overnight Law Society of Ontario, the regulatory body for lawyers in Ontario, Canada (formerly called the Law Society of Upper Canada) Limburg Symphony Orchestra or Limburgs Symfonie Orkest, a Dutch orchestra London School of Osteopathy, an osteopathic school in London, England London Symphony Orchestra, a United Kingdom symphony orchestra Other uses Lateral superior olive, an auditory nucleus in the brainstem Lutetium orthosilicate, an inorganic scintillator Landing Signal Officer, a naval aviator Lesotho (ISO 3166-1 code) Linguistic Sign-Off