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The structure of the title compound, C11H12BrN2S+·C2HO4− (common name 6-bromolevamisole hydrogen oxalate), is stabilized mainly by hydrogen bonds. Hydrogen oxalate anions form parallel coplanar chains via O—H...O hydrogen bonds, while there are N—H...O hydrogen-bonding interactions between the 6-bromolevamisole cations and oxalate anions. Both five-membered rings from the 6-bromolevamisole molecule have a twist conformation. The molecule has an extended conformation, with the 4-bromophenyl substituent positioned equatorially with N—C—C—C and C—C—C—C torsion angles of 39.8 (3) and 100.4 (3)°, respectively.