RY

Ry or RY may mean:

* Ry Cooder
* Ry, Denmark
* Ry, Seine-Maritime, 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
* rekisteröity yhdistys, Finnish 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