Ottoman architecture is an architectural style that developed under the Ottoman Empire over a long period, undergoing some significant changes during its history. It first emerged in northwestern Anatolia around the end of the 13th century and developed from earlier Seljuk Turkish architecture, with influences from Byzantine and Iranian architecture along with other architectural traditions in the Middle East. Early Ottoman architecture experimented with multiple building types over the course of the 13th to 15th centuries, progressively evolving into the classical Ottoman style of the 16th and 17th centuries. This style integrated the Ottoman tradition with influences from the Hagia Sophia, resulting in monumental mosque buildings focused around a high central dome with a varying number of semi-domes. The most important architect of the classical period is Mimar Sinan, whose major works include the Şehzade Mosque, Süleymaniye Mosque, and Selimiye Mosque. The second half of the 16th century also saw the apogee of certain Ottoman decorative arts, most notably in the use of Iznik tiles.

Beginning in the 18th century, Ottoman architecture was opened to external influences, particularly Baroque architecture in Western Europe. Changes appeared during the style of the Tulip Period, followed by the emergence of the Ottoman Baroque style in the 1740s. The Nuruosmaniye Mosque is one of the most important examples of this period. The architecture of the 19th century saw more influences imported from Western Europe, brought in by architects such as those from the Balyan family. Empire style and Neoclassical motifs were introduced and a trend towards eclecticism was evident in many types of buildings, such as the Dolmabahçe Palace. The last decades of the Ottoman Empire saw the development of a new Ottoman revivalist style, also known as the First National Architectural Movement, by architects such as Mimar Kemaleddin and Vedat Tek. Since the dissolution of the Ottoman Empire in 1922, the traditional Ottoman style has been imitated in the construction of many new mosques in Turkey and in some constructions projects beyond Turkey.

Ottoman dynastic patronage was concentrated in the historic capitals of Bursa, Edirne, and Istanbul (Constantinople), as well as in several other important administrative centers such as Amasya and Manisa. It was in these centers that most important developments in Ottoman architecture occurred and that the most monumental Ottoman architecture can be found. Major religious monuments were typically architectural complexes, known as a külliye, that had multiple components providing different services or amenities. In addition to a mosque, these could include a madrasa, a hammam, an imaret, a sebil, a market, a caravanserai, a primary school, or others. Ottoman constructions were still abundant in Anatolia and in the Balkans (Rumelia), but in the more distant Middle Eastern and North African provinces older Islamic architectural styles continued to hold strong influence and were sometimes blended with Ottoman styles.

The first Ottomans were established in northwest Anatolia near the borders of the Byzantine Empire. Their position at this frontier encouraged influences from Byzantine architecture and other ancient remains, and there are examples of architectural experimentation under many local Turkish dynasties in the region during this period. One of the early Ottoman stylistic distinctions that emerged was a tradition of designing more complete façades in front of mosques, especially in the form of a portico with arches and columns. Another early distinction was the reliance on domes. The first Ottoman structures were built in Söğüt, the earliest Ottoman capital, and in nearby Bilecik, but they have not survived in their original form. They include a couple of small mosques and a mausoleum built in Ertuğrul's time (late 13th century). Bursa was captured in 1326 by the Ottoman leader Orhan. It served as the Ottoman capital until 1402, becoming a major center of patronage and construction. Orhan also captured İznik in 1331, turning it into another early center of Ottoman art. In this early period there were generally three types of mosques: the single-domed mosque, the T-plan mosque, and the multi-unit or multi-dome mosque.

The Hacı Özbek Mosque (1333) in İznik is the oldest Ottoman mosque with an inscription that documents its construction and it is the oldest example of the Ottoman single-domed mosque, consisting of a square chamber covered by a dome. Another early single-domed mosque is the Green Mosque in İznik (1378–1391), which is the first Ottoman mosque for which the name of the architect (Hacı bin Musa) is known. The main dome covers a square space and the transition between the round base of the dome and the square chamber below is achieved through a series of triangular carvings known as "Turkish triangles", a type of pendentive which was common in Anatolian Seljuk and early Ottoman architecture.

In 1334–1335, Orhan built a mosque in İznik that no longer stands but has been excavated by archeologists. It is significant as the earliest known example of a type of building called a zaviye (from Arabic zawiya), "T-plan" mosque, or "Bursa-type" mosque. This type of building is characterized by a central court, typically covered by a dome, with iwans (domed or vaulted halls that are open to the courtyard) on three sides, one of which is oriented towards the qibla (direction of prayer) and contains the mihrab (wall niche symbolizing the qibla). The front façade usually incorporated a portico along its entire width. The iwans on the side and the other various rooms attached to these buildings may have served to house Sufi students and traveling dervishes, since the Sufi brotherhoods were one of the main supporters of the early Ottomans. Variations of this floor plan were the most common type of major religious structure sponsored by the early Ottoman elites. The "Bursa-type" label comes from the fact that multiple examples of this kind were built in and around Bursa, including the Orhan Gazi Mosque (1339), the Hüdavendigar (Murad I) Mosque (1366–1385), the Yildirim Bayezid I Mosque (completed in 1395), and the Green Mosque built by Mehmed I (1412–1424). The Green Mosque is notable for its extensive tile decoration in the cuerda seca technique. It is the first instance of lavish tile decoration in Ottoman architecture. These mosques were all part of larger religious complexes (külliyes) that included other structures offering services such as madrasas (Islamic colleges), hammams (public bathhouses), and imarets (charitable kitchens).

The most unusual mosque of this period is the multi-domed congregational mosque known as the Grand Mosque of Bursa or Ulu Cami. The mosque was commissioned by Bayezid I after the Battle of Nicopolis in 1396 and finished in 1399–1400. It consists of a large hypostyle hall divided into twenty equal bays in a rectangular four-by-five grid, each covered by a dome supported by stone piers. After Bayezid I was defeated at the Battle of Ankara in 1402, the Ottoman capital was moved to Edirne in Thrace. The last major multi-dome mosque built by the Ottomans (with some exceptions), is the Old Mosque (Eski Cami) in Edirne, built between 1403 and 1414. In later periods, the multi-dome building type was adapted for use in non-religious buildings instead, such as bedestens (market halls).

The reign of Murad II (r. 1421–1451) marked an important architectural development in the form of the Üç Şerefeli Mosque, built in Edirne from 1437 to 1447. It has a very different design from earlier mosques, with a nearly square floor plan divided between a rectangular courtyard and a rectangular prayer hall. The open-air courtyard has a central fountain and is surrounded by a portico of arches and domes, with a decorated central portal leading into the courtyard from the outside and another one leading from the courtyard into the prayer hall. The prayer hall is centered around a huge dome which covers most of the middle part of the hall, while the sides of the hall are covered by pairs of smaller domes. The central dome is larger than any other Ottoman dome built before this. The mosque has a total of four minarets, arranged around the four corners of the courtyard. Its southwestern minaret was the tallest Ottoman minaret built up to that time and features three balconies (from which the mosque's name derives). This new design was a culmination of previous architectural experimentation and foreshadowed the features of later Ottoman mosque architecture.