
Giovanni Codagnello (c. 1154 – after 1235) was an Italian notary and historian.
Codagnello was born around 1154 in Piacenza. His surname was sometimes Latinized as Caputagni. Between 1199 and 1230, he is attested as a notary in documents from Piacenza and Cremona as both certifier and witness. He was for a time the pro tempore notary of the government of Piacenza. On 31 March 1202, he drew up a treaty of peace between, on the one side, Piacenza and Milan and, on the other, Pavia. In 1222, he witnessed a charter in Fiorenzuola d'Arda.
In 1226, Codagnello campaigned for the restoration of the Lombard League and Piacenza's joining it. He is best known for his collection of historical writings in Latin. Altogether these cover the history of the world from the Great Flood down to 1235. It is probable that Codagnello spent the years 1230–1235 working on his history and died not long after.
Codagnello identifies himself as the author and compiler in some verses at the beginning of his collection. The rest of the collection is in prose. It is contained in a single parchment manuscript, now in Paris, Bibliothèque nationale, MS lat. 4931. The manuscript is not the autograph but an early copy, made in Italy in the mid-13th century. It contains ten distinct texts, some authored or edited by Codagnello and others merely copied by him:
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