PK-huset, Commercial building in Norrmalm, Stockholm, Sweden

PK-huset is a combined office and department store building at Hamngatan and Norrlandsgatan in Norrmalm, Stockholm. Its facades are clad in red-pink Älvdalen quartzite, rising four storeys along Hamngatan with eight-storey towers toward NK and at the Norrlandsgatan corner. Between the towers lies a 1,250 m² planted roof terrace, and the ground and basement levels contain shopping passages, with the ground-floor gallery linked directly to NK.

The complex was built between 1971 and 1974 for Sveriges Kreditbank on the site of the Sagerska houses, demolished in 1970. The bank merged with Postbanken in 1974 to form Post- och Kreditbanken, giving the building its PK name. Architects Backström & Reinius designed it; the retail space was first intended for the MEA department store.

The name PK comes from Post- och Kreditbanken, formed in 1974 when Sveriges Kreditbank merged with Postbanken; the building was originally built as Kreditbank's head office. The ground-floor galleria connects directly to the NK department store, and the walkways along Hamngatan and Norrlandsgatan are designed as arcades.

The building stands at the heart of Norrmalm and is within easy walking distance of three metro stations and Stockholm Central. Visiting on a weekday during the day gives the best chance of finding all the shops in the arcade open.

The building was named "valuable" in the Stockholm City Museum's 2007 Norrmalm inventory, receiving a blue marking together with 13 other Norrmalm buildings from 1960–1980. Sverigehuset and Sparbankshuset, diagonally opposite, got the same rating.