A new and distinct cultivar of Chrysanthemum plant named 'Yobrunswick', characterized by its uniform and outwardly spreading plant habit; strong and freely branching growth habit; dark green-colored foliage; uniform flowering response and habit; typically grown as a spray-type; early flowering habit; daisy-type inflorescences with spoon-shaped ray florets; white-colored ray florets; and good postproduction longevity with plants maintaining good substance and color for about three weeks in an interior environment.