RY

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