[en] Extraction of Am(III), Cm(III), Eu(III), Fe(III), Pu(IV), and Th(IV) from alkaline oxalate solutions using solutions of tertiary amines (TOA), quaternary ammonium cations (aliquat-336), and β-diketones (PMBP) in various organic solvents is studied. The effects of oxalate concentration, solution alkalinity, and phase-contact time on the completeness of extraction are found. It is established that Am(III), Cm(III), Th(IV), and Pu(IV) can be separated from Fe(III) in 0.3 M oxalate solution in the pH range 4-7 (β_Fe(III)/Me = 2.5·10³) using 0.5 M TOAOH. The system PMBP in Ml BK-oxalates was promising for separating tri- and tetravalent actinides [the separation factor of Am(III) and Cm(III) from Pu(IV) is 1.3·10²]. 10 refs., 4 figs., 1 tab