Arnold I of Laurenburg, German: Arnold I. von Laurenburg (died before 1154),^[1] was count of Laurenburg and an ancestor of the House of Nassau.

Arnold was a son of Dudo of Laurenburg (German: Dudo von Laurenburg) and the fourth of the seven daughters of count Louis I of Arnstein, possibly her name was Irmgardis or Demudis.^[1]

Arnold is mentioned as count of Laurenburg between 1124 and 1148. He probably ruled together with his brother Rupert I.^[1][2] Arnold and Rupert built Nassau Castle around 1124.^[3]

In 1124, Arnold became the Vogt of Idstein. Idstein had come under the control of Count Dudo in 1122.^{[citation needed]}

Arnold was the Vogt of St. George's Monastery in Limburg 1124–1148.

No marriage has been mentioned of Arnold.^[1]

• Parts of this article were translated from the corresponding Dutch Wikipedia on August 21st, 2018.
• Becker, E. (1983) [1950]. Schloss und Stadt Dillenburg. Ein Gang durch ihre Geschichte in Mittelalter und Neuzeit. Zur Gedenkfeier aus Anlaß der Verleihung der Stadtrechte am 20. September 1344 herausgegeben [Castle and City Dillenburg. A Journey through their History in Medieval and Modern Times. Published to celebrate the grant of Town Privileges on 20 September 1344] (in German) (Neuauflage ed.). Dillenburg: Der Magistrat der Stadt Dillenburg.
• Dek, A.W.E. (1970). Genealogie van het Vorstenhuis Nassau [Genealogy of the Royal House of Nassau] (in Dutch). Zaltbommel: Europese Bibliotheek. OCLC 27365371.
• Hesselfelt, H.F.J. (1965). "De oudste generaties van het Huis Nassau" [The oldest generations of the House of Nassau]. De Nederlandsche Leeuw, Maandblad van Het Koninklijk Nederlandsch Genootschap voor Geslacht- en Wapenkunde [The Dutch Lion, Monthly Journal of the Royal Dutch Society for Genealogy and Heraldry] (in Dutch). 1965 (11): 354–365.
• Schwennicke, Detlev (1998). Europäische Stammtafeln, Neue Folge [European Genealogies, New Series] (in German). Vol. Band I. Frankfurt am Main: Vittorio Klostermann GmbH. ISBN 3-465-02743-4. Table 60.
• Thiele, Andreas (1994). Erzählende genealogische Stammtafeln zur europäischen Geschichte, Band I, Teilband 2: Deutsche Kaiser-, Königs-, Herzogs- und Grafenhäuser II [Annotated genealogies from European History, Volume 1, Part 2: German Imperial, Royal, Ducal and Comital Houses II] (in German) (2nd ed.). Frankfurt am Main: RG Fischer Verlag. ISBN 3-89501-023-5.
• Venne, J.M. van de; Stols, Alexander A.M. (1937). Geslachts-Register van het Vorstenhuis Nassau [Genealogy of the Royal House of Nassau] (in Dutch). Maastricht: A.A.M. Stols’ Uitgevers-Maatschappij.
• Vorsterman van Oyen, A.A. (1882). Het vorstenhuis Oranje-Nassau. Van de vroegste tijden tot heden [The Royal House of Orange-Nassau. From the earliest days until the present] (in Dutch). Leiden & Utrecht: A.W. Sijthoff & J.L. Beijers.

• Family tree of the early House of Nassau Archived 2016-03-24 at the Wayback Machine.