A new and distinct cultivar of Chrysanthemum plant named ‘；DLFABB12’；, characterized by its upright plant habit； vigorous growth habit； dark green-colored leaves； uniform and freely flowering habit； strong upright flowering stems with numerous inflorescences； decorative pompon-type inflorescences with red purple to purple and white-colored ray florets； excellent postproduction longevity； and tolerance to low and high temperatures.
