Ambérac (French pronunciation: [ɑ̃beʁak]) is a commune in the Charente département, region in the Nouvelle-Aquitaine region of southwestern France.

Ambérac is in the north-west part of the Charente department some 24 km north by north-west of Angouleme, 6 km south-east of Aigre, and 8 kilometres north-west of Saint-Amant-de-Boixe. Access to the commune is by the D88 road from Aigre in the north-west which passes through the village and continues south-east to Xambes. The D69 road also comes from Marcillac-Lanville in the west to the village then continues east to Villognon. There are a number of hamlets in the commune apart from the village.

The nearest railway station is that of Luxé, 5 km to the north-east which is served by a TER service to Angoulême, Poitiers, and Bordeaux.

North-west of the town along the Aume and the Route d'Aigre there are a few hamlets: les Picots, les Citres, les Marais; and some farms: le Cambouil, les Thibauds, and le Goyaud. To the east, on the road to Mansle, there is Les Granges.

The commune sits on a limestone bedrock dating from the Upper Jurassic (Kimmeridgian). Alluvium dated from the Quaternary period cover the alluvial valleys of the Aume and Charente, the most recent being on the floodplain. There are also some areas of Sand on the slopes dating to the Quaternary glaciations.

The relief of the commune is that of a low plateau and a confluence of two valleys. The highest point in the commune is at an altitude of 101 m located on the western boundary. The lowest point is 46 m located along the Charente on the south-western boundary. The town was built on the banks of the river at 62 m above sea level.

The Charente traverses the commune downstream from Mansle and upstream from Angouleme. The village is built on the right bank and downstream of the confluence of the Aume, which flows north of the town. The Aume rises at Bouin, Deux-Sèvres, and passes through Aigre.

As in the three-quarters in the south and west of the department, the climate is oceanic Aquitaine.