We survey experimental research on multi-unit auctions with an emphasis on topics that may be of a unifying interest to experimental, as well as theoretical and empiri- cal economists. Topics include static and dynamic multi-unit auctions; combinatorial auctions and efficient auction design; simultaneous and sequential auctions; bidder asymmetry and endogenous entry, and collusion in auctions. We also discuss behav- ioral regularities observed in multi-unit auction experiments.