The formation of Suleiman's legacy began even before his death. Throughout his reign literary works were commissioned praising Suleiman and constructing an image of him as an ideal ruler, most significantly by Celalzade Mustafa, chancellor of the empire from 1534 to 1557.

Suleiman's conquests had brought under the control of the Empire major Muslim cities (such as Baghdad), many Balkan provinces (reaching present day Croatia and Hungary), and most of North Africa. His expansion into Europe had given the Ottoman Turks a powerful presence in the European balance of power. Indeed, such was the perceived threat of the Ottoman Empire under the reign of Suleiman that Austria's ambassador Busbecq warned of Europe's imminent conquest: "On the Turks' side are the resources of a mighty empire, strength unimpaired, habituation to victory, endurance of toil, unity, discipline, frugality and watchfulness ... Can we doubt what the result will be? ... When the Turks have settled with Persia, they will fly at our throats supported by the might of the whole East; how unprepared we are I dare not say." Suleiman's legacy was not, however, merely in the military field. The French traveler Jean de Thévenot bears witness a century later to the "strong agricultural base of the country, the well being of the peasantry, the abundance of staple foods and the pre-eminence of organization in Suleiman's government".

Through the distribution of court patronage, Suleiman also presided over a Golden Age in Ottoman arts, witnessing immense achievement in the realms of architecture, literature, art, theology and philosophy. Today the skyline of the Bosphorus and of many cities in modern Turkey and the former Ottoman provinces, are still adorned with the architectural works of Mimar Sinan. One of these, the Süleymaniye Mosque, is the final resting place of Suleiman: he is buried in a domed mausoleum attached to the mosque.