Stockholm International Fairs, Exhibition and congress center in Älvsjö, Stockholm, Sweden

Stockholmsmässan is a long, low exhibition hall in Älvsjö, south Stockholm, with a flat roof overhanging a glass facade. A red circular emblem and the name "Stockholmsmässan" are mounted on the glass, and cylindrical glass entrance enclosures with curved tops sit at ground level. The complex covers 114,000 m², including 70,000 m² of exhibition space.

The idea came from brothers Börje and Folke Claeson, who first rented the Royal Tennis Hall for a fair in 1942 under the name S:t Eriks-Mässan. In 1964 the City of Stockholm and the Chamber of Commerce took over, and the first spadeful of earth at Älvsjö was turned on 12 November 1966. King Gustav VI Adolf inaugurated the halls on 20 March 1971; the name Stockholmsmässan replaced S:t Eriks-Mässan in 1976.

The name S:t Eriks-Mässan, used from 1942, referred to Stockholm's patron saint; the company only became Stockholmsmässan in 1976, though the public had long called the Älvsjö site Älvsjömässan. Recurring fairs include Antikmässan, first held in 1977, FORMEX, Nordiska Trädgårdar and Stockholm Furniture Fair. Outside the halls stand two concrete elements with Siri Derkert's Ristningar i betong, the same reliefs seen at Östermalmstorg metro station.

The center sits in Älvsjö, roughly 10 minutes by train from Stockholm's main station, making public transport connections straightforward. Parking is available on-site, and the venue is accessible for visitors with different mobility needs.

In March 2020, Region Stockholm and the Swedish Armed Forces built a field hospital inside the halls, with 140 care places ready by 30 March and plans for about 600. The site also holds Siri Derkert's concrete reliefs outside and the sculpture group Gran Tour by Peter Johansson and Barbro Westling.