A shrubbery, shrub border or shrub garden is a part of a garden where shrubs, mostly flowering species, are thickly planted. The original shrubberies were mostly sections of large gardens, with one or more paths winding through it, a less-remembered aspect of the English landscape garden with very few original 18th-century examples surviving. As the fashion spread to smaller gardens, linear shrub borders covered up walls and fences, and were typically underplanted with smaller herbaceous flowering plants. By the late 20th century, shrubs, trees and smaller plants tend to be mixed together in the most visible parts of the garden, hopefully blending successfully. At the same time, shrubs, especially very large ones, have become part of the woodland garden, mixed in with trees, both native species and imported ornamental varieties.

The word is first recorded by the OED in a letter of 1748 by Henrietta Knight, Lady Luxborough to the fanatical gardener William Shenstone: "Nature has been so remarkably kind this last Autumn to adorn my Shrubbery with the flowers that usually blow at Whitsuntide". The shrubbery developed to display exciting new imported flowering species, initially mostly from the East Coast of British America, and quickly replaced the older formal "wilderness", with compartments of smaller trees surrounded by hedges, and little colour. It was a further part of the garden, beyond the terrace and flower garden that the house usually opened onto, and when mature provided shade on hot days, some shelter from a wind, and some privacy.

The shrubbery was at first the development of the plant collector wing of the growing movement of English gardeners, who in the early and mid-18th century eagerly awaited the new seeds and cuttings arriving at London nurserymen such as Thomas Fairchild (d. 1729) from America. There was some tension between them and the more landscape-oriented gardeners such as Capability Brown, though Brown's designs in fact allowed for flower gardens and shrubberies, which have very rarely survived as well as his landscape vistas in the parks.

Shrubbery is also the collective noun for shrubs in other contexts, sometimes used for shrubland, a type of natural landscape dominated by shrubs or bushes. The many distinct types of these include fynbos, maquis, shrub-steppe, shrub swamp and moorland.