Bursa (Greek: Προῦσα, translit. Proûsa, Latin: Prusa, Ottoman Turkish: بروسه) is a city in northwestern Turkey and the administrative center of Bursa Province. The fourth-most populous city in Turkey and second-most populous in the Marmara Region, Bursa is one of the industrial centers of the country. Most of Turkey's automotive production takes place in Bursa.

As of 2019, the Metropolitan Province was home to 3,056,120 inhabitants, 2,161,990 of whom lived in the 3 city urban districts (Osmangazi, Yildirim and Nilufer) plus Gursu and Kestel, largely conurbated.

Bursa was the first major and second overall capital of the Ottoman State between 1335 and 1363. The city was referred to as Hüdavendigar (خداوندگار, meaning "God's Gift" in Ottoman Turkish, a name of Persian origin) during the Ottoman period, while a more recent nickname is Yeşil Bursa ("Green Bursa") in reference to the parks and gardens located across its urban fabric, as well as to the vast and richly varied forests of the surrounding region. Mount Uludağ, known in classical antiquity as the Mysian Olympus or alternatively Bithynian Olympus, towers over the city, and has a well-known ski resort. Bursa has rather orderly urban growth and borders a fertile plain. The mausoleums of the early Ottoman sultans are located in Bursa, and the city's main landmarks include numerous edifices built throughout the Ottoman period. Bursa also has thermal baths, old Ottoman mansions, palaces, and several museums.

The shadow play characters Karagöz and Hacivat are based on historic personalities who lived and died in Bursa in the 14th century.