We present a comprehensive linear and nonlinear optical characterization of virgin and refined olive oil samples using a 532 nm continuous-wave (CW laser). The nonlinear optical properties were evaluated using the Z-scan technique to determine the nonlinear absorption and refraction coefficients. Additionally, the linear absorption characteristics were evaluated by UV-visible spectroscopy, giving the absorption edge values for both virgin and refined olive oil samples. The UV-visible absorption spectroscopy also indicated the type of nonlinear absorption, which is, in this case, two-photon absorption for both samples. This integrated linear and nonlinear approach can be effectively employed to assess the quality of the olive oil. Beam profiling was performed using the knife-edge technique, enabling accurate measurements of beam waist at the focus.