Allariz is a town and municipality in the province of Ourense, Autonomous Community of Galicia, Spain. It occupies the center of the western half of the province, connecting with the towns of Taboadela, Paderne, Sandiás, Vilar de Santos, Rairiz de Veiga, Xunqueira de Ambía, A Merca and A Bola. The area of the municipality is 85,3 km² and there are 6.188 inhabitants in 16 parishes.
The hydrographic system is made up of the River Arnoia, which crosses the municipality from east to west. The surrounding hills are covered with pine and native oak. The valley itself is very fertile and the river banks are lined with trees.
The climate can be defined as inland Atlantic with continental influences. Summers are warm with highs averaging 25 °C, while winter highs average 12 °C.
Allariz is a town which relies on tourism and proximity to the provincial capital of Ourense, fifteen kilometers away. Because of its picturesque location on the banks of the Arnoia, it is a sought-after location for summer houses. The main highway crossing the south of Galicia, the Autovia das Rias Baixas, crosses the Arnoia on one of the longest highway bridges in Spain and provides easy access to the town.