Geosynthetic reinforced soil (GRS) bridge abutments are becoming popular in recent days for various transportation infrastructures. Although several static analysis of bridge abutments have been carried out till date, very limited studies have been carried out regarding their dynamic performance. This paper carries out a numerical investigation of a bridge abutment subjected to seismic loading. Simulations were carried out using the finite element software, ABAQUS. After proper validation of the numerical model, fly ash was used as the backfill material to study the variation in the performance of the abutment in comparison to conventional backfill material. The results showed that the performance of the reinforced soil abutment using fly ash as the backfill material is satisfactory.