Gerard III of Guelders (1185 – 22 October 1229) was the Count of Guelders and Zutphen from 1207 until his death in 1229. He was a son of Count Otto I of Guelders, and is sometimes called Gerard IV or Gerard V. Gerard married Margaretha of Brabant, the daughter of Duke Hendrik I of Brabant and Matilda of Flanders, Duchess of Brabant, in 1206.