Xavier Delamarre (French pronunciation:[ɡzavjedəlamaʁ]; born 5 June 1954) is a Frenchlinguist,lexicographer, and formerdiplomat. He is regarded as one of the world's foremost authorities on theGaulish language.^[1]

With linguistRomain Garnier, Delamarre is the co-publishing editor ofWékwos, a journal founded in 2014 and devoted toIndo-Europeancomparative linguistics.^[2][3]

Born on 5 June 1954,^[4] Xavier Delamarre graduated fromSciences Po in 1977, then studied theLithuanian language atINALCO. In 1984, he publishedLe Vocabulaire indo-européen, a lexicon ofProto-Indo-European words.^[2] In 2001, Delamarre published an influentialetymological dictionary of theGaulish language entitledDictionnaire de la langue gauloise. A second enlarged edition was issued in 2003.^[5][6]

Alongside his research inIndo-European andCeltic linguistics, Delamarre followed a career of diplomat from 1984 to 2014. He worked for the French diplomatic post inHelsinki (1984–86), then inHarare (1989–92),Vilnius (1992–97),Osaka (1997–98), andLjubljana (1998–2000). From 2004 to 2006, Delamarre served as first counsellor at the French embassy in Helsinki, then as special adviser for international cooperation to the Secretary-General of the French government from 2008 to 2014. He retired from diplomatic duties in 2014 to focus on linguistic studies.^[2]

Since 2019, Delamarre has been an associate researcher for theCNRS-PSL AOrOc laboratory (Archéologie & Philologie d'Orient et d'Occident). Along withPierre-Yves Lambert, he is also the co-administrator ofThesaurus Paleo-Celticus, a CNRS project launched in 2019 and aiming to update and replaceAlfred Holder'sAlt-celtischer Sprachschatz (1913).^[7][2]

• Le Vocabulaire indo-européen: lexique étymologique thématique. Adrien Maisonneuve. 1984.ISBN 978-2-7200-1028-6.
• Dictionnaire de la langue gauloise: Une approche linguistique du vieux-celtique continental (2 ed.). Errance. 2003 [2001].ISBN 9782877723695.
• Noms de personnes celtiques dans l'épigraphie classique. Nomina Celtica Antiqua selecta Inscriptionum. Errance. 2007.ISBN 978-2-87772-350-3.
• Noms de lieux celtiques de l'Europe ancienne. -500 – +500. Dictionnaire. Errance. 2012.ISBN 978-2-87772-483-8.
• Les Noms des Gaulois. Studies in Old Celtic Names. Les Cent Chemins. 2017.ISBN 978-1-5468-6932-0.
• Une Généalogie des Mots. De l'Indo-Européen au Français : Introduction à l'étymologie lointaine. Errance. 2019.ISBN 978-2-87772-634-4.
• Dictionnaire des thèmes nominaux du gaulois. Ab-/Iχs(o)-. Vol. 1. Les Cents Chemins. 2019.ISBN 978-1-7980-5040-8.
• Dictionnaire des thèmes nominaux du gaulois. Lab-/Xantus. Vol. 2. Les Cents Chemins. 2023.ISBN 978-2957086030.

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