Jakarta Fair (Indonesian: Pekan Raya Jakarta or PRJ, lit. 'Jakarta Grand Week') is a fair held annually in Jakarta International Expo Kemayoran, Jakarta, Indonesia, in June and July. It features exhibitions, trade promotions, shopping, music performances, various shows, amusement rides and a food festival. Jakarta Fair is part of a series of events to held to celebrate the capital's anniversary, which falls on June 22. The Jakarta Fair sees exhibitors from across the country display a whole range of goods and products ranging from specialty food items to traditional handmade arts and crafts. In addition to the many exhibitors, there is also live entertainment including music, dance and cultural performances.

The fair incorporates trade exhibitions and entertainment that existed in Batavia (now Jakarta) during Dutch East Indies era. Originally the annual fair took place in Koningsplein (now Merdeka square) in Weltevreden Batavia and it was called "Pasar Gambir".

Pekan Raya Indonesia (old spelling Pekan Raja Indonesia), or Indonesia Fair, was held for three consecutive years between 1953 and 1955. It was held on the site where Atma Jaya University now stands, on what is then called Kebayoran Road (now Jalan Jendral Sudirman). The 1950s version of the Pekan Raya was held to stimulate the economy of Indonesia by boosting national exports and bringing new technology and products to Indonesia, with main focus on restructuring the economy after the end of the colonial period.

The first Pekan Raya Indonesia was held between 29 August to 4 October 1953, officially known in English as "The First Indonesian International Trade & Industrial Fair". China was the main international exhibitor. Among the notable features of the first Pekan Raya is the Chinese pavilion, which is the largest international pavilion in the Fair.

The second Pekan Raya Indonesia in 1954 has the Soviet Union as the main international exhibitor.

The last Pekan Raya Indonesia in 1955 has the United States as the main international exhibitor. Leading US companies e.g. Ford, General Motors, Caterpillar, Goodyear, RCA and Pan Am make exhibition in the fair. The Holiday on Ice was first introduced to Indonesia through the Pekan Raya Indonesia 1955, whose performance in Jakarta was attended by the wife of the late President, Eleanor Roosevelt. Among other notable features of the last Pekan Raya Indonesia is the Stand Televisi ("television stand"), among the first introduction of a true color television to Indonesia.

The modern Jakarta Fair or Pekan Raya was held again for the first time in 1968 and inaugurated by president Suharto. The fair took place from 5 June to 20 July 1968 on southern part of Merdeka square near National Monument. The idea to hold a grand fair in Jakarta was initiated by Jakarta's governor Ali Sadikin in 1967, inspired by the colonial era Pasar Gambir. He sought a centralized grand fair to combine several night markets ("Pasar Malam") held throughout the city. Since then it has become an annual event as part of the city's anniversary celebrations. The longest Jakarta Fair, of 71 days, was held in 1969. Usually Jakarta Fair is held for 30 to 35 days. United States president Richard Nixon is one of the VIP guest that visit Jakarta Fair 1969.

Part of the Jakarta Fair was the Taman Ria fun park, which was operated all year on the southwest corner of Medan Merdeka, forming part of the Jakarta fairgrounds.