A new and distinct cultivar of Hydrangea plant named ‘；Hortmafarfa’；, characterized by its upright to outwardly spreading plant habit； moderately vigorous to vigorous growth habit and moderate growth rate； freely branching habit with strong and thick sturdy stems； freely flowering habit； large mophead-type inflorescences with double-type flower that are bright pink in color； and good postproduction longevity.
