The Summerland disaster occurred when a fire spread through the Summerland leisure centre in Douglas on the Isle of Man on the night of 2 August 1973. Fifty people were killed and 80 seriously injured. The scale of the fire has been compared to those seen during the Blitz.

Summerland was opened on 25 May 1971. It was a climate-controlled building covering 3.5 acres (1.4 ha) on Douglas's waterfront, consisting of 50,000 sq ft (4,600 m2) of floor area constructed at a cost of £2 million. The building's exterior and the interior were designed by two different architects—they did not coordinate their planning with each other and thereby created a venue with significant fire risks that were to become apparent only later.

Summerland was designed to accommodate up to 10,000 tourists and consisted of a dance hall, five floors of holiday games, a rollerskating rink, restaurants and public bars. It was an example of Modernist architecture incorporating advanced controlled internal climate, built with novel construction techniques using new plastic materials. The street frontage and part of the roof was clad in Oroglas, a transparent acrylic glass sheeting.