The Marmara region (Turkish: Marmara Bölgesi) is a geographical region of Turkey.

Located in East Thrace, it is bordered by Greece and the Aegean Sea to the west, Bulgaria and the Black Sea to the north, the Black Sea Region to the east, and the Aegean Region to the south. At the center of the region is the Sea of Marmara, which gives the region its name. The largest city in the region is Istanbul. Other big cities are Bursa, İzmit, Balıkesir, Tekirdağ, Çanakkale and Edirne.

Among the seven geographical regions, the Marmara region has the second-smallest area, yet the largest population; it is the most densely populated region in the country.

The name of the region comes from the Marmara Sea which is named after the Marmaros island, now connected to Balıkesir. "Marmaros" means "marble" in Greek. This name was given to the island because of the significant amount of marble found there. Over time, this name also came to be used for the sea itself.

The Greeks named the Marmara Sea "Propontis" by combining two words: "pro" and "pontis". In Greek, "pro" means "before" and "pontis" means "sea." They chose this name because they used to sail on the Sea of Marmara to reach the Black Sea.

• Çatalca - Kocaeli Section (Turkish: Çatalca - Kocaeli Bölümü)
  • Adapazarı Area (Turkish: Adapazarı Yöresi)
  • Istanbul Area (Turkish: Istanbul Yöresi)
• Ergene Section (Turkish: Ergene Yöresi)
• Southern Marmara Section (Turkish: Güney Marmara Bölümü)
  • Biga - Gallipoli Area (Turkish: Biga - Gelibolu Yöresi)
  • Bursa Area (Turkish: Bursa Yöresi)
  • Karesi Area (Turkish: Karesi Yöresi)
  • Samanlı Area (Turkish: Samanlı Yöresi)
• Yıldız Section (Turkish: Yıldız Bölümü)

• Balkan mixed forests
• Euxine-Colchic deciduous forests

• Northern Anatolian conifer and deciduous forests (Turkey)

• Aegean and Western Turkey sclerophyllous and mixed forests
• Anatolian conifer and deciduous mixed forests

Provinces that are entirely in the Marmara Region:

• Edirne
• İstanbul
• Kırklareli
• Kocaeli
• Tekirdağ
• Yalova

Provinces that are mostly in the Marmara Region:

• Balıkesir
• Bilecik
• Bursa
• Çanakkale
• Sakarya

The Yıldız Mountains and Uludağ are in the Marmara Region. Islands in the Aegean Sea are Gökçeada and Bozcaada, and in the Sea of Marmara are Marmara Island, Avşa, Paşalimanı, İmralı and the Princes' Islands of Istanbul.

The Marmara region has a borderline Mediterranean and humid subtropical climate on the Aegean Sea and south Marmara Sea coasts, and an oceanic climate on the Black Sea coast. Summers are warm to hot and moderately dry whereas winters are cool, wet and sometimes snowy. The coastal climate keeps the temperatures relatively mild.

• East Thrace
• Sea of Marmara
• Dardanelles
• Bosporus
• Turkish Straits
• Geographical regions of Turkey
• Provinces of Turkey

• Golyaka Village, Bursa (in Turkish)