The HTBLVA Graz-Ortweinschule is a Höhere technische Bundeslehr- und Versuchsanstalt in the district Geidorf of the Austrian city Graz.
Archduke John of Austria founded a trade association, which established a drawing class for locksmithing, masonry, and carpentry in 1837 at the Universalmuseum Joanneum.
Within the framework of the Trades Association, a winter school for master builders and polier [de] also began in 1866.
From 1926 to 1932, a new school building was constructed on Ortweinplatz according to the plans of the architect Adolf von Inffeld [de].
Since 1987, the school has been located in a new building on the Körösistraße in the north of Graz, next to the BRG ("Bundesrealgymnasium") Körösi, which is on the corner of Ortweingasse.