This is Volume 3 of a French translation of Pappus of Alexandria's "Collectiones Quae Supersunt E Libris Manu Scriptis Edidit Latina Interpretatione Et Commentariis." Pappus was one of the last great mathematicians of antiquity, and his "Collection" is a vast and important work covering a wide range of mathematical topics. This volume offers invaluable insights into the mathematical knowledge and practices of the ancient world, presented with detailed Latin interpretations and commentaries. It remains a significant resource for scholars interested in the history of mathematics, science, and classical studies.