Concrete is one of the most widely used construction materials in civil and structural engineering due to its good compressive strength, durability, workability, and availability of its constituent materials. The quality and performance of concrete depend on several factors, among which the water-cement ratio plays a fundamental role in determining its mechanical properties and long-term performance. The water-cement ratio refers to the ratio of the weight of water to the weight of cement used in a concrete mixture. This ratio directly affects the workability of fresh concrete as well as its mechanical strength after hardening. Increasing the amount of water in the mixture improves workability, mixing, and casting. However, excessive water content leads to the formation of pores and voids within the concrete structure after the evaporation of excess water, negatively affecting its strength and durability. This study aims to investigate the effect of different water-cement ratios on the mechanical properties of concrete by preparing several concrete mixtures with varying water-cement ratios while maintaining the other mixture components and curing conditions constant. This approach ensures accurate comparison of the experimental results. Concrete specimens are prepared and tested after specific curing periods, such as 7 and 28 days, to evaluate changes in their mechanical performance. The study primarily focuses on compressive strength, which is considered one of the most important indicators for evaluating concrete quality and its ability to withstand applied loads. In addition, splitting tensile strength and flexural strength can be investigated to determine the influence of the water-cement ratio on the concrete's resistance to tensile and bending stresses. The expected results indicate an inverse relationship between the water-cement ratio and concrete strength within mixtures that have appropriate workability and curing conditions. Increasing the water-cement ratio generally increases porosity and reduces the density of the internal concrete structure, resulting in lower mechanical strength. Conversely, excessively low water-cement ratios may reduce workability and prevent proper compaction and sufficient cement hydration, which can also negatively affect the final strength of concrete. The importance of this study lies in identifying the appropriate water-cement ratio that achieves a balance between workability, mechanical strength, and durability. Its findings can contribute to improving concrete mix design, reducing defects caused by excessive water content, and enhancing the efficiency of construction materials in engineering projects. In conclusion, controlling the water-cement ratio is one of the essential factors in producing concrete with good mechanical properties and reliable structural performance. Therefore, selecting an appropriate ratio according to design requirements and technical specifications is crucial for ensuring the quality of concrete structures and extending their service life.