Nectar robbing is a foraging behavior utilized by some organisms that feed on floral nectar. "Nectar robbers" usually feed from holes bitten in flowers, rather than by entering through the flowers' natural openings. Often, nectar robbers avoid contact with the floral reproductive structures, and therefore do not facilitate plant reproduction via pollination. Because many species that act as pollinators also act as nectar robbers, nectar robbing is considered to be a form of exploitation of plant-pollinator mutualism. Nectar robbers vary greatly in species diversity and include species of carpenter bees, bumblebees, stingless Trigona bees, solitary bees, wasps, ants, hummingbirds, passerine birds, and flowerpiercer birds (Diglossia spp.). Nectar robbing has also been observed in mammals, including a fruit bat species, the squirrel species Tamiops swinhoei hainanus, which robs nectar from flowers of the ginger plant Alpinia kwangsiensis.

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