After the November 15 bombings, a second day of the 2003 Istanbul bombings occurs in Istanbul, Turkey, destroying the Turkish head office of HSBC Bank AS and the British consulate.

November 15 is the 319th day of the year in the Gregorian calendar; 46 days remain until the end of the year.

The 2003 Istanbul bombings were a series of suicide attacks carried out with trucks fitted with bombs detonated at four locations in Istanbul, Turkey, on 15 and 20 November 2003.

Istanbul is the largest city in Turkey, constituting the country's economic, cultural, and historical heart. With a population over 15 million, it is home to 18% of the population of Turkey. Istanbul is among the largest cities in Europe and in the world by population. It is a city on two continents; about two-thirds of its population live in Europe and the rest in Asia. Istanbul straddles the Bosphorus—one of the world's busiest waterways—in northwestern Turkey, between the Sea of Marmara and the Black Sea. Its area of 5,461 square kilometers (2,109 sq mi) is coterminous with Istanbul Province.

HSBC Bank A.Ş., the Turkey subsidiary of the HSBC Group, is a bank with its head office in Istanbul.