The Gemeenlandshuis Zwanenburg (Dutch pronunciation: [ɣəˈmeːnlɑntsɦœy ˈsʋaːnə(m)bʏr(ə)x]), located on Haarlemmerstraatweg in Halfweg, is a former Gemeenlandshuis of the Hoogheemraadschap van Rijnland designed by Pieter Post and built 1645–1648.