The Poortgebouw is a national monument located at Stieltjesstraat 38 in the Kop van Zuid area of Rotterdam, the Netherlands. It was built beside the River Maas in 1879 and experienced a range of uses until it was squatted 3 October 1980. It had been standing empty for 2 years and was squatted as a protest intended to highlight the lack of affordable residential housing in Rotterdam.

Rotterdam is the second-largest city in the Netherlands after the national capital of Amsterdam. It is in the province of South Holland, part of the North Sea mouth of the Rhine–Meuse–Scheldt delta, via the "New Meuse" inland shipping channel, dug to connect to the Meuse at first and now to the Rhine.