“Parametric Design for Composite Bridges”. Bridge designs usually exhibit significant geometric variations between different structural solutions, which implies a low degree of reuse of the models in similar projects. To overcome this limitation, a parametric approach is presented as an answer since it enhances the bridge design process, increasing efficiency by reducing time and effort. The proposed methodology is based on the creation of a flexible geometric model through the introduction of parameters and numerical relationships between them. Therefore, from a generative development, different geometric and structural solutions of composite bridges could be created by modifying the parameters’ values within the same model.