Beylikdüzü is a district in the European suburbs of Istanbul, Turkey, located north of the Sea of Marmara, south of Esenyurt, east of Büyükçekmece, and west of Avcılar.

Beylikdüzü is populated especially after the 1999 İzmit earthquake by the people from older districts of Istanbul who preferred to move to newly constructed buildings in Beylikdüzü because of their fear for safety of the old buildings. When the Metrobus (rapid bus system) is extended from Avcılar to Beylikdüzü in 2012, Beylikdüzü is affected by the second wave of migration. With the advance of Metrobüs the perception of “distance” has changed and places which seemed far away before became closer, so many moved to Beylikdüzü. Its population has grown from around 3000 in the early 1990s to 350,000 by 2018. Since the population of Beylikdüzü consists mostly of migrants from other districts of Istanbul or Turkey, and Beylikdüzü is a relatively recently established city, Beylikdüzü has gained a welcoming atmosphere for the newcomers without having any social stratification. The popularity of Beylikdüzü has increased greatly in the last few years and the region became a hot spot for residential and commercial investments. Beylikdüzü has the highest rapid increase in the land and property value in Turkey, making its investors richer in a very short time. Beylikdüzü was one of the few municipalities in Turkey that switched from AKP to CHP in 2014 with an overwhelming (>10%) vote.

Beylikdüzü is the modern part of Istanbul which is improving more every day. Beylikdüzu together with the Ataköy Marina district are now attracting the upper-middle class because of their good infrastructure, and are seeing the construction of new luxury developments. The attraction is also increased by their close proximity to the Istanbul Atatürk Airport.[8] Beylikdüzü is home to the most shopping malls in Istanbul and is considered a heaven for shopping, also referred to as the “AVM cumhuriyeti” (or republic of shopping in English).

Beylikdüzü is the one of the most cosmopolitan districts of Istanbul, thus hosting a mosaic of different cultures of Turkey together with people from other countries. Beylikdüzü matches the European cities with its high green space per person. The green space is over 10M² per person in Beylikdüzü. Almost in every street and avenue trees are planted at equal distance; making the whole neighborhood as an open-air museum. The construction of the botanical park in the huge valley between Adnan Kahveci and Cumhuriyet neighbourhood is still going on.

Istanbul Seafood Wholesale Market Hall in Kumkapı (in historical peninsula) is planned to be established in its new and bigger complex in Beylikdüzü. However, people with environmental awareness in Beylikdüzü have a concern that the new seafood market which is planned to be constructed by land reclamation on the Gürpinar coast of Beylikdüzü, can disturb the natural underwater current which cleans the Büyükçekmece Bay. Environmentalist people fear that having stopped the currents the bay can turn into a sewage zone and lost all its beauty. Plus some experts claim that the seafood supply is mostly carried from the land not from the sea so it will add an unnecessary traffic pressure on the Beylikdüzü’s existing road system.

Annual average temperature of the sea water is 14.4 °C.

Annual average precipitation is 54.2 mm, with lowest in August and highest in December. The strongest winds are seen also in December.

Highest snowfall in Beylikdüzü is 60 cm.

Since Beylikdüzü is approximately 150 meters above the sea level, it is low in humidity and it is windier than the other central districts of Istanbul. Also Beylikdüzü is known for its clean and dry air. Winters tend to be stronger in Beylikdüzü compared to downtown areas. Since Beylikdüzü is surrounded by trees the change of seasons in Beylikdüzü offers a great visual show for its residents.

Choices of public transportation are very rich for the area. Access to the region became easier with the extension of the Metrobüs line to Beylikdüzü. Metrobüs operates 24 hours so it is possible to go to Beylikdüzü directly from the downtown anytime. It takes approximately 60 minutes by Metrobus to go to Mecidiyeköy – Zincirlikuyu (Istanbul downtown) from Beylikdüzü. In addition to Metrobus there are express public buses going directly to Beylikdüzü from Taksim square and vice versa. 145T collects its passengers from Cumhuriyet, Barış and Büyükşehir neighbourhoods of Beylikdüzü and goes to Taksim using the highway. 145M collects its passengers from Adnan Kahveci neighbourhood and Esenyurt Cumhuriyet neighbourhood and goes to Taksim by getting on the highway.

Since Beylikdüzü is developed around the E-5 highway it is also possible to take any public bus that comes from Bakırköy or Yenibosna and goes towards Büyükçekmece direction.

In 2019 a subway line between Beylikdüzü and Bakırköy will be built. Later on from Bakırköy it will be connected to Yenikapı transfer station.

It is 57 kilometers from Beylikdüzü to Istanbul International Airport and there is a shuttle service which takes 60 – 70 minutes from airport to Beylikdüzü and vice versa. The shuttle service stops are Airport-Çatalca-Büyükçekmece-Tüyap-Cumhuriyet Mahallesi-Beylikdüzü Marmarapark AVM.

Beylikdüzü is connected to the TEM highway with Hadıköy and Esenyurt service roads.