Gaidoald (Latin: Gaidoaldus, Gaidualdus or Gadoaldus) was the second Lombard duke of Trent, succeeding Euin in 595. Our main source for Gaidoald's life is Paul the Deacon's Historia Langobardorum, which in turn depends on the lost Historiola of Secundus of Non, Gaidoald's contemporary. Nothing is known of Gaidoald before his accession to the duchy, although he was probably already a powerful and influential man. No sources speak of his family relations, and all speculation is based on onomastics. The -oald element in his name (from Proto-Germanic *waldaną, to rule) was especially common among the Agilolfing family of neighbouring Bavaria, who were of Frankish origin.