Villa Horion, Neoclassical governmental building in Düsseldorf, Germany.

Villa Horion is a neoclassical building in Düsseldorf with a symmetrical facade and artistic ornaments created by local artist Hermann Nolte in the early 20th century. The structure displays the refined forms of that era through its proportions and decorative details.

Built from 1909 to 1911 by architect Hermann vom Endt in the Neoclassical style, the villa was the official seat of Johannes Horion, Landeshauptmann of the Rhine Province, alongside the neighbouring Landeshaus. From 1945 to 1956 it served as a British officers' mess, and after a fundamental renovation it housed the office of North Rhine-Westphalia's Minister-President from 1961 to 1999. A further renovation in 2001 preceded its use by the state parliament.

The villa is named after Johannes Horion, Landeshauptmann of the Rhine Province, who resided here; it was never a private family home. Since October 2016 it has housed the Landtag's "Haus der Parlamentsgeschichte", whose displays trace over 70 years of North Rhine-Westphalia's parliament, including the four venues where it met from 1946, and end in the former cabinet room.

The villa faces the Landeshaus across Johannes-Rau-Platz in Carlstadt, a short walk from the Rhine promenade. The parliamentary history exhibition opened in October 2016; guided tours finish in the former cabinet room of the state government.

The exhibition opened in October 2016 and traces over 70 years of North Rhine-Westphalia's parliament, from the state's founding in 1946. It names the four meeting places of the Landtag, beginning with the Düsseldorf opera house, where the first session took place on 2 October 1946. Guided tours end in the former cabinet room of the state government.