Moorish architecture is a style within Islamic architecture which developed in the western Islamic world, including al-Andalus (on the Iberian peninsula) and what is now Morocco, Algeria, and Tunisia (part of the Maghreb). Scholarly references on Islamic architecture often refer to this architectural tradition by a more geographic designation, such as architecture of the Islamic West or architecture of the Western Islamic lands. The use of the term "Moorish" comes from the historical Western European designation of the Muslim inhabitants of these regions as "Moors". Some references on Islamic art and architecture consider this term to be outdated or contested.

This architectural tradition integrated influences from pre-Islamic Roman, Byzantine, and Visigothic architectures, from ongoing artistic currents in the Islamic Middle East, and from North African Berber traditions. Major centers of artistic development included the main capitals of the empires and Muslim states in the region's history, such as Córdoba, Kairouan, Fes, Marrakesh, Seville, Granada and Tlemcen. While Kairouan and Córdoba were some of the most important centers during the 8th to 10th centuries, a wider regional style was later synthesized and shared across the Maghreb and al-Andalus thanks to the empires of the Almoravids and the Almohads, which unified both regions for much of the 11th to 13th centuries. Within this wider region, a certain difference remained between architectural styles in the more easterly region of Ifriqiya (roughly present-day Tunisia) and a more specific style in the western Maghreb (present-day Morocco and western Algeria) and al-Andalus, sometimes referred to as Hispano-Moresque or Hispano-Maghrebi.^{: viii–ix : 121, 155}

This architectural style came to encompass distinctive features such as the horseshoe arch, riad gardens (courtyard gardens with a symmetrical four-part division), square (cuboid) minarets, and elaborate geometric and arabesque motifs in wood, stucco, and tilework (notably zellij). Over time, it made increasing use of surface decoration while also retaining a tradition of focusing attention on the interior of buildings rather than their exterior. Unlike Islamic architecture further east, western Islamic architecture did not make prominent use of large vaults and domes.^: 11

Even as Muslim rule ended on the Iberian Peninsula, the traditions of Moorish architecture continued in North Africa as well as in the Mudéjar style in Spain, which adapted Moorish techniques and designs for Christian patrons. In Algeria and Tunisia local styles were subjected to Ottoman influence and other changes from the 16th century onward, while in Morocco the earlier Hispano-Maghrebi style was largely perpetuated up to modern times with fewer external influences.^{: 243–245} In the 19th century and after, the Moorish style was frequently imitated in the form of Neo-Moorish or Moorish Revival architecture in Europe and America, including Neo-Mudéjar in Spain. Some scholarly references associate the term "Moorish" or "Moorish style" more narrowly with this 19th-century trend in Western architecture.