Shiregi (Mongolian: Ширэги, ᠰᠢᠷᠭᠢ, Chinese: 昔里吉/失列吉; pinyin: Xīlǐjí/Shīlièjí, Persian: شيركى) was a Mongol prince from the Borjigin clan, great-grandson of Genghis Khan.
Shiregi was born to Möngke Khan and his concubine Bayavchin from Bayaut tribe at unknown time.
Initially a supporter of Ariq Böke, he defected to Kublai Khan, for which he was created King of Heping (河平王) in 1267.
However, soon in Autumn 1276 Shiregi was incited by Togh-Temür, another grandson of Tolui to rise against Kublai and claim the empire.
However, Kaidu refused to join Shiregi in his bid to throne,[2] so they went to Upper Yenisei region to use it as a base to capture Karakorum later.