Ji (Chinese: 紀國) was a fief that ruled over the mid-northern part of today's Shandong Province in China from the Western Zhou dynasty to the Spring and Autumn period.

Bronze tools of the Ji people had been found in places such as Shouguang, Laiyang, and Yantai.

In the 6th century BC, the marquis of Ji (紀) had a dispute with Duke Ai of Qi.

King Yi of Zhou sided with Marquis of Ji and executed Duke Ai by boiling him to death.

After Duke Huan of Lu and a Zheng prince was murdered by Duke Xiang of Qi, Ji's allies Lu and Zheng lost the ability to assist Ji in defending a Qi invasion.