Abstract: The modular vehicle running board, subject matter of the invention, comprises a profile (10) provided with projections (12) and cavities (14) and (15) for the modular arrangement of assembly components and trims (20), (40) and (41), allowing the arrangement of lighting points (36) and the attachment of a non-slip step (30), in order to optimize the assembly system and allow greater product variability in a single profile/chassis. The result is a modular vehicle running board endowed with new constructive characteristics facilitating manufacture and adaptation in different models.