The province of Sassari (Italian: provincia di Sassari; Sardinian: provìntzia de Tàtari; Sassarese: prubìnzia di Sàssari; Algherese: província de Sàsser; Gallurese: pruvincia di Sassari) was a province in the autonomous island region of Sardinia, Italy. Its capital was the city of Sassari. On 1 April 2025, the province was suppressed in favor of the new Metropolitan City of Sassari, which corresponds to the 66 western municipalities of the province in its 2005-2015 borders; the easternmost 26 municipalities were reorganized as Province of Gallura North-East Sardinia, corresponding to the borders of the former Province of Olbia-Tempio.
The province had 471,653 inhabitants in 2025.