Silistra Nouă County was a county (județ) of Romania, in Northern Dobruja, with its capital city first at Rasova, later at Cernavodă and finally at Medgidia. It was established on 13 November 1878 and abolished on 1 April 1879. After this, it was integrated into Constanța County, which became the only county in Romanian Dobruja along with Tulcea County. Silistra Nouă County was composed of two plăși ("districts"): Plasa Medgidia (which included Cernavodă and Medgidia) and Plasa Silistra Nouă (which included Rasova). Despite its name, it did not include the city of Silistra.