The nutmegs Myristica are a genus of evergreen trees indigenous to tropical southeast Asia and Australasia. They are important for two spices derived from the fruit, nutmeg and mace.

Nutmeg is the actual seed of the tree, roughly egg-shaped and about 1 inch (20–30 mm) long and 3/4 inch (15–18 mm) wide, and weighing between one quarter and one half ounce (5 and 10 grams) dried, while mace is the dried "lacy" reddish covering or arillus of the seed.

Several other commercial products are also produced from the trees, including essential oils, extracted oleoresins, and nutmeg butter.

The most important species commercially is the Common or Fragrant Nutmeg Myristica fragrans, native to the Banda Islands of Indonesia; it is also grown in the Caribbean, especially in Grenada. Other species include Papuan Nutmeg M. argentea from New Guinea, and Bombay Nutmeg M. malabarica from India; both are used as adulterants of M. fragrans products.

Nutmeg and mace have similar taste qualities, nutmeg having a slightly sweeter and mace a more delicate flavour. Mace is often preferred in light-coloured dishes for the bright orange, saffron-like colour it imparts. Nutmeg is a flavorful addition to cheese sauces and is best grated fresh.