Vasahuset, Early 20th-century residential building in Luthagen district, Uppsala, Sweden.

Vasahuset is a building in Luthagen beside Vasaparken, begun in 1906 to designs by Erik Hahr. It holds Uppsala's best-preserved Jugend ornamentation, floral and geometric details on a facade that was sand-coloured when new, painted blue in the 1970s and again in 2017.

Construction of Vasahuset began in 1906 to designs by architect Erik Hahr. Unlike the nearby Rappska huset, it escaped the demolition wave that removed many buildings in Uppsala, leaving it one of the more interesting surviving buildings of its type in the city.

The building displays Swedish Art Nouveau style through its decorative exterior details and ornamental elements. These features make it an important reference point for understanding local architectural traditions.

Vasahuset stands in Luthagen beside Vasaparken, a short walk from the city centre. The facade is best seen from the park side, where the Jugend ornamentation is visible from street level. The building is residential, so visitors view it from outside.

The building was recognized as Uppsala's most beautiful structure in 2020 through a public competition. This recognition by Arkitektupproret highlights its special standing among the city's modern buildings.