Abzac (French pronunciation: [abzak]; Azac in Limousin dialect) is a commune in the Charente department in the Nouvelle-Aquitaine region of southwestern France.

Abzac is located in the extreme north-east of the department of Charente and borders the communes of Availles-Limouzine, Lessac, Saint-Germain-de-Confolens, Brillac, and Oradour-Fanais. The northern border of the commune is also the border between Charente and Vienne departments.

Abzac village is at the crossroads of two roads: the D729 from Confolens in the south and continuing north to Adriers - the former route Bis from Paris to Spain and the D99 (Route de Brillac) which branches from the D951 in the south-east then continues through the village north-west to Availles-Limouzine. The D951 road passes along the southern border of the commune from Lessac in the south-west to Mezieres-sur-Issoire in the east. Other departmental minor roads pass through the commune such as the D98 from Oradour-Fanais in the east to join the D729 in the north of the commune and the D324 which branches off the D951 in the south and passes through the commune to join the D99 south of the village.

To the northeast of the village, the hamlet of Chardat is nicknamed the Village of Clay. This village is home to many tile and brick makers.

Other smaller hamlets are:

As with the whole north-east of the department of Charente which is called Charente Limousine, the commune is located on the plateau of Limousin in the western part of the Massif Central which is composed of crystalline and metamorphic rocks - relics of the Hercynian orogeny.

A large central part of the commune of Abzac is granite. The west of the commune is composed of paragneiss and diorites. The plateau in the east of the commune is covered with alterite and degraded granite. Small areas in the north of the commune are composed of flinty clay and quartz shingle.

The commune is situated on a plateau inclined towards the west descending to the valley of the Vienne with increasingly steep slopes.