Evaluating the seismic performance of outrigger systems in high-rise buildings is crucial for mitigating the impact of lateral loads. Outrigger systems are essential for optimizing lateral load distribution, enhancing structural stability, reducing lateral drifts, and ensuring occupant safety. This study investigates the performance of standard outrigger (SO) systems, hybrid outrigger (HO) systems, and modified hybrid outrigger (MHO) systems. The analysis focuses on a twenty-storey high-rise building subjected to seismic loads, modelled and simulated using ETABS software. The standard outrigger system comprises a central core with belt trusses at specific floors, connected by outriggers. In contrast, the HO system integrates conventional, offset, and virtual outriggers and the MHO system further incorporates bracings and viscoelastic dampers to improve seismic resilience. These modifications aim to increase lateral stiffness and dissipate seismic energy, thereby reducing lateral drifts and enhancing overall structural stability. Seismic analysis using El-Centro earthquake data is performed to assess the seismic performance of these systems. Key performance indicators include inter-storey drift, displacements, and mode shapes, which collectively determine the effectiveness of the structural systems under seismic loads. Comparative analysis is conducted among various outrigger system configurations, including bracing arrangements and damper placements. The results indicate that the MHO system, which combines bracings and viscoelastic dampers, exhibits superior seismic performance compared to other configurations. Bracings significantly increase lateral stiffness, while strategically placed viscoelastic dampers dissipate seismic energy effectively, thereby reducing lateral drifts. The study highlights the benefits of integrating bracings and viscoelastic dampers within outrigger systems to improve seismic resilience, emphasizing innovative structural configurations in earthquake engineering.