Welf I or Welfo (died before 876) was a Swabian nobleman.
He was a member of the Elder House of Welf.
However, when Conrad and his other sons changed allegiance from King Louis the German to his half-brother King Charles the Bald in 859, Welf disappears from the historical record.
It is assumed that he fell out of favor with King Louis and lost his offices; the Swabian branch of the Elder Welfs was not mentioned again until Rudolf II, Count of Altdorf, who died around 990 and was — according to legend — a descendant of Welf.
This article about a member of the German nobility is a stub.