YY

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
• YY, the production code for the 1969 Doctor Who serial The Space Pirates

• W (disambiguation)

This disambiguation page lists articles associated with the title YY.
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