A numerical study on a rigid projectile (sphere) ricocheting off a water layer is presented in this paper. The time-dependent three-dimensional simulations are carried out for the impact of a solid metal sphere (with radius r) on a quiescent air-water interface. Three types of metal spheres with specific gravity (𝜎𝜎) values ranging from 7.8 to 2.7 (steel, titanium and duralumin) were considered. The numerical results are compared with analytical solutions and experimental data of the ricochet problem available in the literature. A given range of projectile impact velocity (𝑉𝑉 𝑖𝑖 ) are considered with varying impact angles to determine the critical angle of impact 𝜃𝜃 𝑐𝑐𝑐𝑐 -as a function of the Froude number (𝐹𝐹𝐹𝐹 = 𝑉𝑉 𝑖𝑖 2 /𝐹𝐹𝑟𝑟) and 𝜎𝜎. A correlation in the form of 𝜃𝜃 𝑐𝑐𝑐𝑐 = 𝑓𝑓(𝐹𝐹𝐹𝐹, 𝜎𝜎) is proposed for the ricochet of a solid sphere from an airwater interface.