(Th or U)-doped garnet-based ceramics were produced by sintering in air at 1400–1500 °C and 1 atm. from mixture of oxides: CaO, Fe2O3, Al2O3, SiO2, ZrO2, UO2, ThO2, and Gd2O3. Ferrate garnets can accomodate great amount of actinides, Zr, and Gd. Solubility of the elements in the garnet decrease in the row: Gd > Zr > Th > U. Actinides incorporation into the structure decrease with Al and Si content. Capacity of the lattice in respect of various ions, including actinides, neutron absorbers, corrosion products, and processing contaminants, lets to consider the garnet as host phase for actinide wastes with complex chemical composition.