Welf or Hwelf was a 9th century Frankish count. He is the oldest known member of the Elder House of Welf.

Welf is mentioned only once: on the occasion of the wedding of his daughter Judith with Emperor Louis the Pious in 819. Welf was married to Heilwig or Eigilwi, daughter of the Saxon count Isanbart; Heilwig was abbess of Chelles.

Welf and Heilwig had the following children:
• Judith, married Louis the Pious, died 843;
• Rudolf, died 866;
• Conrad, Count of Paris, ancestor of the Welf kings of Burgundy;
• Hemma (Emma), married Louis the German, died 876.