Barenton-Bugny is located some 5 km north by northwest of Laon and 8 km south of Crecy-sur-Serre. The Autoroute des Anglais (A26 autoroute) passes through the commune, and there is an exit just south of the commune to National Highway N2 which passes north-east through the commune. From National Highway N2 the commune can be accessed on road D546 going north to the village then continuing northwest to intersect the D545 going north to Barenton-Cel. The D513 also goes east from the village to Monceau-le-Waast. There is also the D967 road which passes north–south through the western edge of the commune. Apart from the village and a few patches of forest the commune is entirely farmland with no other villages or hamlets.[3]
The northwestern border of the commune is delineated by the Ruisseau de Longedeau which flows into the Ru des Barentons and continues north changing its name a few times before joining the Souche river.[3]
