Fujiwara no Sukemasa (藤原 佐理, 944 – August 19, 998) was a Japanese noble, statesman, and renowned calligrapher of the middle Heian period.

He passed through two minor military positions until, in 967, his adoptive father Fujiwara no Saneyori was appointed as regent to the newly ascended Emperor Reizei.

His work adorned the folding screens used at the daijō-e (大嘗会) feasts following the coronations of Emperors En'yū, Kazan, and Ichijō.

He is counted among the Sanseki group of great calligraphers, along with Ono no Michikaze and Fujiwara no Yukinari, and his flowing and lively handwriting is known in Japanese as saseki (佐跡).

Several examples of original notes he wrote remain, including the National Treasures of Japan Shikaishi (詩懐紙) and Rirakujō (離洛帖).