Citrus maxima (or Citrus grandis), (Common names: shaddock, pomelo, pummelo, pommelo, pamplemousse or shaddok) is an original citrus fruit, with the look of a big grapefruit, native to South and Southeast Asia.

It is usually pale green to yellow when ripe, with sweet white (or, more rarely, pink or red) flesh and very thick albedo (rind pith). It is a large citrus fruit, 15–25 centimetres (5.9–9.8 in) in diameter, usually weighing 1–2 kilograms (2.2–4.4 lb). Leaf petioles are distinctly winged.

The fruit tastes like a sweet, mild grapefruit (which is itself believed to be a hybrid of Citrus maxima and the orange), though the typical shaddock is much larger than the grapefruit.