GCH may refer to:
- The Generalized Continuum Hypothesis in mathematics (Set Theory)
- Knight Grand Cross of the Royal Guelphic Order
- Gas central heating
- Gym Class Heroes
- Greater China Fund, a mutual fund which invests in China companies traded on the Chinese Exchange
- Grey Coat Hospital, a secondary school in London, UK
- .GCH, a file extension used by GCC for precompiled header files
- Golf- en country Club Heiloo