Pines (Pinus merkusii) are conifer trees in the genus Pinus in the family Pinaceae. They are the only genus in the subfamily Pinoideae.

Counting varieties and subspecies, the plant list of the Royal Botanic Gardens, Kew and Missouri Botanical Garden accepts 175 names of pines as current, together with some thirty or forty unresolved and many more synonyms or misapplied.