Althoffblock, Residential architectural ensemble in Innenstadt-West, Germany

The Althoffblock is a residential complex in western Dortmund organized around several large courtyards with green spaces, playgrounds, and lawns spanning thousands of square meters. The four-story buildings create an enclosed environment that separates residents from the surrounding streets.

Construction began in 1914 as a project of a housing cooperative that would eventually manage thousands of apartments throughout Dortmund. The cooperative's building programs shaped how many residents lived in the city for generations.

The complex is named after Hermann Althoff (1860–1948), who chaired the later LVA Westfalen from 1899 to 1925 and campaigned for better housing for workers. The cooperative running it, founded on the site, keeps a neighbourhood meeting point at Steubenstraße 16 with the Caritas, offering courses for older residents and publishing a small newspaper.

Apartments typically range from 45 to 75 square meters, accommodating different household sizes. Vehicle access is limited to maintenance purposes, so the complex is designed primarily for pedestrian movement.

The cross is not a set of seven blocks but the intersection of Althoffstrasse and Roseggerstrasse in the southern part of Innenstadt-West. Car access and garages serve management only, and some gardens cannot be reached by any driveway at all.