Concrete is known to be brittle and susceptible to cracks due to its low tensile strength and strain capacities. Researchers have explored various methods to improve its properties, such as adding admixtures, supplementary cementitious materials, and fibres. Nowadays, many researchers have focused on multiple nanomaterials, such as nano-silica, nano-titanium oxide, nano-iron oxide, and carbon nanotubes in concrete matrices. However, limited studies have been conducted using reduced graphene oxide (RGO) nanoparticles in concrete structures like beams. The study aims to explore the potential of incorporating RGO nanoparticles in reinforced concrete beams and to analyse the effects on various properties of the concrete structure. Test samples are prepared with 0%, 5%, 10%, and 15% nanoparticles by volume of superplasticiser, followed by compressive strength, split tensile strength, and flexural strength tests. Four-point bending tests are conducted on RC beams to evaluate load–deflection behaviour. The findings highlight the potential of RGO in improving the mechanical performance and durability of structural concrete elements.