Bağcılar is a municipality and district located on the European side of Istanbul Province, Turkey. Situated near the city center, it lies just north of Bahçelievler and is positioned between the TEM and D100 major ring roads. The district covers an area of 23 km².
As the fourth most populous district in the Istanbul Municipality, Bağcılar has a population of 740,069 as of 2022. The area underwent rapid development between the 1970s and 1990s and is primarily residential in nature. Public transportation in the neighborhood is served by the Istanbul Metro and the T1 line of the Istanbul Tram.