Ginestar is a municipality in the comarca of Ribera d'Ebre, in the province of Tarragona, Catalonia, Spain. It is located in the southern part of Catalonia, within the Ebro river valley region.
As a municipality, Ginestar forms part of the local administrative structure of the Ribera d'Ebre comarca, which lies inland in the province of Tarragona. The surrounding area is characterised by the Ebro river and its terraces, a landscape typical of this part of Catalonia.