Nijō Ishi/Tameko (Japanese: 二条 為子) was a representative poetess of the Nijō poetic school in the latter half of the Kamakura period. She was rewarded with Junior Third Rank (贈従三位, Zo-Jusanmi) posthumously. She was a descendant of Fujiwara no Teika, and the daughter of Nijō Tameyo, a great poet. She was the wife of Crown Prince Takaharu-shinnō (later Emperor Go-Daigo-tennō).