Margarita Robertson, a.k.a. Margi Robertson, is a New Zealand fashion designer descended from Greek–Ukrainian immigrants. Based in Dunedin, New Zealand, Robertson designs for her label Nom D, known for its deconstructed, androgynous style. It is one of New Zealand's most successful labels and one of its most acclaimed, showing at New York Fashion Week from the fall 2004 season onwards.

Robertson is the sister of Elisabeth Findlay, the equally well known designer of the Zambesi label.

She lives with her husband Chris Robertson in Dunedin.