Shakya may refer to:

• Shakya, the ancient Shakya Republic.
• Newar, community in Nepal and North India.
• Thích (釋), surname used in Vietnam.

• Union of Cinema Production Workers
• Union of Commercial and Industrial Workers
• Union of Communication Workers
• Union of Communist Fighters
• Union of Communist Militants
• Union of Communists of Armenia
• Union of Communists of Kurdistan
• Union of Communist Struggles – The Flame
• Union of Communist Students
• Union of Communist Youth
• Union of Composers
• Union of Composers of Russian Federation
• Union of concerned scientists
• Union of Congolese Patriots
• Union of Congolese Socialist Youth
• Union of Conscientiously Work-Shy Elements
• Union of Construction, Allied Trades and Technicians
• Union of Councils for Jews in the Former Soviet Union
• Union of Councils for Soviet Jews
• Union of Cracow and Vilna
• Union of Cracow and Vilnius
• Union of Cracow and Wilno
• Union of Croats of Macedonia
• Union of Crowns
• Union of Czech and Slovak Zoological Gardens