Otto II (died 8 November 1111) was a Graf (Count) of Habsburg and one of the founding members of the Habsburg family. He was the son of Werner I, Count of Habsburg. Otto II was likely born in the late 1050s or early 1060s. Otto inherited the county of Klettgau & Altembourg from his father; Werner I, Count of Habsburg. In 1108, Otto accompanied King Henry V on a campaign against Hungary. On his return, in 1111, he was murdered. Otto is presumed to be the first person to adopt the title Graf von Habsburg. He married Hilla, countess von Pfirt (died c. 1076), with whom he had two children, Werner II and Adelheid.