Open class

Open class may refer to:

• Open class (linguistics), a word class readily accepting new items
• Open class (horse racing), a standardbred harness racing event open to all comers
• Open class (track and field), an event classification
• Open classes (programming languages), the ability to extend already-defined classes
• Open 60 Class, a type of monohull sailboat
• FAI Open Class, a glider competition class with unlimited wingspan
• IBM Open Class (IOC), a C++ class library
• Open class system, a state of society