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 m) mixed-use development in the Başakşehir district of Istanbul, centered around one of Turkey's largest shopping malls with 154,000 m (1,660,000 sq ft) of gross leasable area.

The complex also includes:

• offices
• Hilton hotel (175 rooms, opened 2020)
• IMAX theater/Cinetech fifteen-screen multicinema
• MOİ Sahne (lit. "MOI Stage") theater (700 seats)
• MOİPark amusement park
• nature park
• gourmet center
• terraced gardens
• swimming pools, club and spa
• sports fields
• WOX Turkey İllüzyon ve Oyuncak Müzesi (illusion and toy museum)

It opened in April 2014 with about 350 retail stores. Milestones in Turkish retail included the first two-story LC Waikiki store, the first H&M home store in Turkey, the first full-line Victoria's Secret store in the country and the second Debenham's store in Turkey after its Istanbul Cevahir location. Debenhams closed both locations in 2017.

Retail anchors and larger tenants as of June 2024 include:

• Boyner department store
• Decathlon sporting goods
• DeFacto clothing
• FLO shoes
• H&M clothing and home stores
• Koçtaş home improvement/DIY
• Koton clothing
• LC Waikiki clothing
• Marks & Spencer clothing
• Media Markt electronics and appliances
• 5M Migros hypermarket ("5M" is the largest Migros format)
• Özdilek hypermarket
• TeknoSA electronics

The two more upscale Turkish department store chains (Beymen and Vakko) do not have branches in the mall, but there is a Vakko Boutique.

International Council of Shopping Centers (ICSC) "VIVA (Vision, Innovation, Value, Achievement) Best-of-the-Best" award for sustainability, 2017. Reasons cited were its being a LEED Gold Certified building, incorporation of skylight roofing, a greywater drainage system, 90% usage rate of LED lights, and inclusion of five separate atriums providing plentiful natural light.

• Mall of Istanbul official website (English version)