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YY or variants may refer to:

  • YY.com, a major Chinese social network
  • yy (digraph), digraph used in various Latin alphabets
  • Yy (musician), Canadian musician
  • YY, the call sign prefix for radio stations in Venezuela
  • Y. Y., pseudonym of Robert Wilson Lynd (1879–1949), Irish essayist
  • Peptide YY 3-36, a peptide secreted by the gut in response to a meal, and reduces appetite