Ry or RY may mean:

  • Ry Cooder
  • Ry, Denmark
  • Ry, Seine-Maritime, a municipality in France
  • Rydberg constant, a unit of energy used in quantum physics related to the ground state energy of the hydrogen atom
  • Rebel yell
  • Railway
  • Relay
  • Ry (suffix), a Finnish suffix for a registered Non-profit organization
  • RY (test signal), a character string used to test five-level teleprinter channels
  • The stock symbol (tsx2 RY, nyse2 RY) for the Royal Bank of Canada
  • Consolidated RY, a former cargo aircraft of the U.S. Navy