Fujiwara no Mototsune(藤原 基経, 836 – February 25, 891), also known as Horikawa Daijin(堀川大臣), was a Japanese statesman, courtier and politician of the early Heian period.

He was born the third son of Fujiwara no Nagara, but was adopted by his powerful uncle Fujiwara no Yoshifusa, who had no sons. Mototsune followed in Yoshifusa's footsteps, holding power in the court in the position of regent for four successive emperors.