Assemini (; ) is a town and comune (municipality) in the Metropolitan City of Cagliari in the autonomous island region of Sardinia in Italy, located about northwest of Cagliari in the plain of the Cixerri, Flumini Mannu and Sa Nuxedda rivers. It has inhabitants.
It includes forest areas which are part of the Sulcis Regional Park. It also has a long tradition in the production of ceramics, starting in the Carthaginian era.
Assemini is part of the Cagliari metropolitan area and borders the municipalities of Cagliari, Capoterra, Decimomannu, Elmas, Nuxis, San Sperate, Santadi, Sarroch, Sestu, Siliqua, Uta and Villa San Pietro.