Fujiwara no Kamatari (藤原鎌足, 614–669 A.D.) was the founder of the Fujiwara clan in Japan. His clan in birth was the Nakatomi. He was son of Nakatomi no Mikeko, and his name in birth was Nakatomi no Kamatari (中臣鎌足). He received the surname Fujiwara from Emperor Tenji of Japan just prior to dying.

He was a friend and supporter of the Prince Nakanooe, later the Emperor Tenji. In 645 Prince Nakanooe and Kamatari made a coup d'etat in the court. They slew Soga no Emishi who had a strong influence to the Empress Kogyoku. During his life Kamatari supported the Emperor Tenji. The Emperor gave him the highest rank Taishokukan and a new clan name, Fujiwara, as honors.

His son was Fujiwara no Fuhito (or Fubito).