李存璋（？ - 922年），字德璜。山西雲中人。

唐僖宗乾符五年（878年），李克用初在雲中殺段文楚而起事，李存璋與康君立、薛誌勤等為李克用奔走而結交，相從李克用入關，以軍功授國子祭酒，累升萬勝、雄威等軍管領。其後，李存璋跟從李克用討伐幽州節度使李匡儔後，成為李克用義子，十三太保中排行第八，成為義兒軍使。

光化二年，授為澤州刺史，入為牢城使。跟從李嗣昭討平雲州叛將王暉，改為教練使、檢校司空。光化五年，李克用病危時，召張承業與李存璋囑託輔助李存勖。其後李存璋在扶立李存勖為晉王，夷平李克寧的內亂，頗為有功。

李存璋後改為河東馬步都虞候，兼領鹽鐵。當初，李克用為建立吊軍心，縱容軍士，使部下很多時會干擾商市，肆意豪奪，令法司也不能禁止。李存勖初嗣位時，銳於求理。李存璋得行其誌，抑強撫弱，誅殺其豪首，數月之間，紀綱大振，弭群盜，務耕稼，去姦宄，息幸門，當時的人民都稱讚他的材幹。李存璋跟從晉王李存勖大破後梁軍於夾城，轉為檢校司徒。柏鄉大戰中，為三鎮排陣使。天祐十一年（914年），從盟朱友謙於猗氏，授為汾州刺史。後梁大將尹皓攻打慈州，李存璋逆戰打敗他。天祐十三年（916年），王檀進軍逼近太原，李存璋率領汾州軍入城固守，被授職為大同防禦使、應、蔚、朔等州都知兵馬使。同年秋天，契丹攻打蔚州，契丹國主阿保機遣使馳木書以索取賄賂，李存璋斬了他的使者。契丹逼近雲州，李存璋拒守，城中有古鐵車，乃熔古鐵車以做成兵仗，供應給軍士。契丹大軍撒退，李存璋以軍功加檢校太傅、大同軍節度使、應、蔚等州觀察使。天祐十九年（922年）四月，李存璋因染疾病逝於雲州府第。同光初年，追贈為太保、平章事。後晉天福初年，再追贈為太師。

李存璋有子三人，李彥球為裨校，戰歿於鎮州。

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Li Cunzhang (李存璋) (died 922) was a military general in imperial China's Tang dynasty, and later the Jin territory in the ensuing Five Dynasties and Ten Kingdoms period after Tang's collapse. He served the Shatuo leaders Li Keyong — who adopted him as a son — and Li Keyong's biological son and successor Li Cunxu.

He originally joined Li Keyong along with Kang Junli and Xue Zhiqin (薛志勤). After many battles, first against the rebel Huang Chao and later against Zhu Wen, he was eventually named commissioner of the Army of Righteous Sons (義兒軍使). When Li Keyong fell seriously ill, Li Cunzhang supported eunuch Zhang Chengye and others in installing Li Keyong's son Li Cunxu as his successor. The new Prince of Jin named Li Cunzhang commissioner of armed forces (馬步軍使) in Hedong (河東; roughly modern Shanxi) in charge or reorganizing the unregulated troops. Li Cunzhang imposed strict law in all military matters and disciplined the troops. When Li Cunxu fought against Liu Xun in 915, the Later Liang sent an army to attack Jin's capital of Taiyuan, but Li Cunzhang defended the city well. He was promoted defense commissioner (防禦使) and later the military governor of Datong Command (大同軍).