Sinnai, Sìnnia in Sardinian language, is a comune (municipality) of the Metropolitan City of Cagliari in the Italian region Sardinia, located about 12 kilometres (7 mi) northeast of Cagliari.

Sinnai borders the following municipalities: Burcei, Castiadas, Dolianova, Maracalagonis, Quartucciu, San Vito, Settimo San Pietro, Soleminis, Villasalto, Villasimius.

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