Fujiwara no Korechika (藤原 伊周, 974 – February 14, 1010), the second son of Michitaka, was a kugyo (Japanese noble) of the Heian period. His mother was Takashina no Takako, also known as Kō-no-Naishi (高内侍). His sister Teishi (Sadako) was married to Emperor Ichijō, and Korechika aspired to become the regent (Sessho) for his young brother-in-law after his father's death. Korechika's (ultimately fruitless) ambitions pitted him against his powerful uncle, Fujiwara no Michinaga, and the resulting power struggle continued until Empress Teishi's unexpected death. This left Michinaga's daughter, Shoshi, as Ichijō's sole empress, solidifying Michinaga's power at court.
In Chōtoku 2 (長徳２年) (996), Korechika and his younger brother Takaie were exiled to Dazaifu. Korechika was charged with shooting an arrow at Retired Emperor Kazan, and performing an esoteric Shingon curse known as Daigensuihō (大元帥法), which was reserved solely for the emperor. He was pardoned a year later, and subsequently became Jun-Daijin (associate minister; 准大臣).
Korechika is sometimes referred to as Gidō-sanshi (儀同三司) or Sochi no Naidaijin (帥内大臣).