HSO may refer to:
== Orchestras == Harrisburg Symphony Orchestra, Pennsylvania, United States Hartford Symphony Orchestra, Connecticut, United States Helena Symphony Orchestra, Montana, United States Hereford String Orchestra, England Hillsboro Symphony Orchestra, Oregon, United States Hollywood Symphony Orchestra, California, United States Houston Symphony, Texas, United States Huntsville Symphony Orchestra, Alabama, United States
Discovered by embedding cosine similarity (sentence-transformers MiniLM, 384-dim).