Werner I (1030-1096), sometimes known as Werner the Pious, was a German nobleman who acted as count of Klettgau. He was an early member of the House of Habsburg and an ancestor of King Rudolph I of Germany.
His father was Radbot of Klettgau and his mother was Ita or Ida (23 July a. 979 – post 1035), daughter of Adalbert II (d. 1033), Count of Saargau and Metz of the House of Matfriede, and Judith, daughter of Conrad I of Swabia.
In 1057, Werner married Reginlinde of Nellenbourg (1027–1090). He had two sons: Otto II, and Albert II (also known as Albrecht II or Adalbert II).