Butyllithium may refer to one of 5 isomeric organolithium reagents of which 3 are commonly used in chemical synthesis:

• n-Butyllithium, abbreviated BuLi or ⁿBuLi
• sec-Butyllithium, abbreviated sec-BuLi or ^sBuLi, has 2 stereoisomers, but is commonly used as racemate
• isobutyllithium
• tert-Butyllithium, abbreviated tert-BuLi or ^tBuLi

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