Fujiwara no Sadakata (藤原 定方?, 873–932), also known as Sanjo Udaijin (三条右大臣), was a Japanese poet and courtier. His father was Fujiwara no Takafuji, and the poet Fujiwara no Kanesuke was his cousin and son-in-law. His son Asatada was also a poet. One of his poems is included in Hyakunin Isshu.