A new and distinct cultivar of Osteospermum plant named `Sunny Dark Florence`, characterized by its erect, compact growth habit, with short inflorescence stems, nonvariegated leaves, elliptic ray florets formed in one or two complete whorls, its vibrant orange ray floret color, with the under side of the ray florets having red-purple striations at the center and tips, and its dark violet-black disc florets.