Li Sijian (Chinese: 李思諫) (died 908), probably né Tuoba Sijian (拓拔思諫), was an ethnically-Dangxiang warlord in the latter years of Chinese Tang Dynasty and Tang's successor state Later Liang of the Five Dynasties and Ten Kingdoms Period, who controlled Dingnan Circuit (定難, headquartered in modern Yulin, Shaanxi) as its military governor (Jiedushi) in de facto independence.