Lastadie was a quarter of central Königsberg, Germany. Its territory is now part of Kaliningrad, Russia.
The name Lastadie is derived from the Medieval Latin Lastagium, referring specifically to sailing ballast and generally to loading docks. In Old High German it became ladastat and in Middle Low German Lastadie. In the Low Prussian dialect of Königsberg it was pronounced Lastaadje. While medieval docks were also built by Kneiphof (in Vordere Vorstadt) and Löbenicht (in neighboring Anger), the usage of "Lastadie" in Königsberg referred almost exclusively to those of Altstadt built south of Laak.
The oldest docks of Königsberg were located on an island then known as Vogtswerder within the Pregel River. The 1286 charter of Altstadt allowed the town to build these initial docks (later known as the Kai, meaning quay) on the western coast of the island, connected to Altstadt by the Grüne Brücke (Green Bridge). With the establishment of Kneiphof on the island Vogtswerder as a rival town in 1327, however, Altstadt was forced to move its dock operation.
Documented in 1339, the new Lastadie docks were built to the southwest outside of Altstadt's original walls. This new warehouse district was eventually bounded by the roads Neuer Graben and Reifschlägerstraße to the west and north, respectively, and the Pregel to the east and south. In 1804 Ludwig von Baczko described Lastadie as being bounded by Altstadt, Laak, the Pregel, the 17th century city walls, and Holländer Baum.