<p>This study examines a novel approach to enhancing the seismic performance of high-rise reinforced concrete (RCC) buildings by incorporating fluid viscous dampers within optimally positioned outrigger systems. Nonlinear pushover analysis is conducted on 10-, 15-, and 20-storey RCC buildings with damped outrigger systems strategically positioned along the building height. The analysis evaluates seismic performance across various configurations, including bare frames (BFs), bare frames with shear core walls, and bare frames with shear wall cores coupled with multiple damped outriggers. The key response parameters of the building, such as capacity curves, base shear, storey displacements, interstorey drift ratios (IDRs), and performance points, are assessed, with a focus on nonlinear hinge formation at both performance and collapse points. The results demonstrate that incorporating three damped outriggers significantly enhances the seismic performance of buildings across all heights. For the 10-storey buildings, reductions of up to 91% in storey displacement and 54% in IDR are observed, with similar trends confirmed in the 15- and 20-storey buildings. The nonlinear performance improves considerably, particularly at performance and collapse points, emphasising the efficiency of damped-outrigger systems. This research highlights the effectiveness of core shear walls, optimal outrigger placement, and energy dissipation mechanisms in mitigating seismic impacts. The findings establish that a configuration featuring three damped outriggers with a core shear wall offers superior seismic resilience for high-rise RCC buildings, marked by enhanced lateral force resistance, reduced structural deformation, and improved nonlinear response during seismic events.</p>