A new and distinct cultivar of Chrysanthemum plant named ‘；G20ARL01WH’；, characterized by its upright, outwardly spreading and uniformly rounded plant habit； moderately vigorous growth habit； freely branching habit； dense and full plant habit； flexible stems； dark green-colored leaves； uniform and freely flowering habit； long flowering period； and large decorative-type inflorescences with ray florets that are light pale yellow in color.
