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Abstract. The extraction processes of indium(III) from media of various complexing ability, chloride and nitrate, in toluene or chloroform, have been elucidated. Indium is extracted from 1 M nitrate medium as In(PBI) 3 with HPBI alone and as I n ( P B I ) 3 ( TO P O ) 2 with TO P O -H P B I mixtures, while it is extracted from 1 M chloride medium as In(PBI) 3 a n d InCl x (PBI) 3-x (TOPO) 2 . The complexation of In in the aqueous phases, the extraction of nitric acid and various solute-solute and solute-diluent interactions in the organic phases must be taken into account in the processes. The results are compared with those obtained previously with 1-phenyl-3-methyl-4-benzoyl-pyrazol-5-one under the same conditions.