Gallus Anonymus, also known by his Polonized variant Gall Anonim, is the name traditionally given to the anonymous author of Gesta principum Polonorum, composed in Latin between 1112 and 1118. Gallus is generally regarded as the first historian to have described the history of Poland. His Chronicles are an obligatory text for university courses in Polish history. Very little is known of the author himself and it is widely believed that he was a foreigner.

The Gesta principum Polonorum is the oldest known medieval chronicle documenting the history of Poland from the legendary times until 1113. Written in Latin by an anonymous author, it was most likely completed between 1112 and 1118, and its extant text is present in three manuscripts with two distinct traditions. Its anonymous author is traditionally called Gallus, a foreigner and outcast from an unknown country, who travelled to the Kingdom of Poland via Hungary. Gesta was commissioned by Poland's then ruler, Boleslaus III Wrymouth; Gallus expected a prize for his work, which he most likely received and of which he lived the rest of his life.