A four-centred arch or four-centered arch is a low, wide type of arch with a pointed apex. Its structure is achieved by drafting two arcs which rise steeply from each springing point on a small radius, and then turning into two arches with a wide radius and much lower springing point. It is a pointed sub-type of the general flattened depressed arch. This type of arch uses space efficiently and decoratively when used for doorways. It is also employed as a wall decoration in which arcade and window openings form part of the whole decorative surface. Two of the most notable types are known as the Persian arch, which is moderately "depressed" and found in Islamic architecture, and the Tudor arch, which is much flatter and found in English architecture. Another variant, the keel arch, has partially straight rather than curved sides and developed in Fatimid architecture.

The Tudor architectural style is the final development of medieval architecture in England and Wales, during the Tudor period (1485–1603) and even beyond, and also the tentative introduction of Renaissance architecture to Britain. It followed the Late Gothic Perpendicular style and, gradually, it evolved into an aesthetic more consistent with trends already in motion on the continent, evidenced by other nations already having the Northern Renaissance underway Italy, and especially France already well into its revolution in art, architecture, and thought. A subtype of Tudor architecture is Elizabethan architecture, from about 1560 to 1600, which has continuity with the subsequent Jacobean architecture in the early Stuart period.