This paper presents a parametric study on the monotonic and cyclic flexural behaviour of circular rubberized Concrete-Filled Steel Tube (CFST) beam-columns. Finite Element (FE) models were developed using the FE software ABAQUS (2013). The FE models were validated against sixteen circular rubberized CFST beam-columns incorporating different parameters including diameter to thickness ratio (D/t ratio), concrete cube strength (aggregate replacement ratio), axial load ratio, and lateral load type (monotonic and cyclic) conducted by Silva et al. (2016). Subsequently, the validated FE modelling methodology was used to conduct a parametric study to investigate the influence of D/t ratio, concrete cube strength, steel yield strength, axial load ratio, and lateral load type on the ductility and cumulative energy dissipation behaviour of circular rubberized CFST beam-columns.