The Mall of İstanbul (with a dotted capital I, the Turkish spelling of the word İstanbul; abbreviated form MOİ) is a 3,800,000 sq ft (350,000 m2) mixed-use development in the Başakşehir district of Istanbul, centered around one of Turkey's largest shopping malls with 154,000 m2 (1,660,000 sq ft) of gross leasable area.

Other facilities comprise an amusement park (MOİPark), a nature park, a gourmet center, terraced gardens, swimming pools, a club and spa, sports fields, and WOX Turkey, an illusion and toy museum.

[4] As of June 2024, the retail anchors and larger tenants at the complex include prominent brands such as Armani Exchange, Beymen Club, Brooks Brothers, Calvin Klein, Gant, Guess, Harry Potter Store, Lacoste, Massimo Dutti, Mango, Sephora, Swarovski, Tommy Hilfiger, Vakko Boutique, Boyner, Decathlon, DeFacto, H&M, Koçtaş, Koton, LC Waikiki, Marks & Spencer, MediaMarkt, 5M Migros and TeknoSA.

[5] In 2017, the Mall of Istanbul received the "VIVA (Vision, Innovation, Value, Achievement) Best-of-the-Best" award for sustainability from the International Council of Shopping Centers.

The recognition was attributed to several factors, including its status as a LEED Gold Certified building, the use of skylight roofing, the implementation of a greywater drainage system, a 90% usage rate of LED lighting, and the presence of five atriums designed to maximize natural light.