The synthesis method for obtaining sub-micrometric structures of rare earth manganese-based mixed oxide compounds is described. Pore wetting of porous polycarbonate templates with the liquid precursor was followed by a two-stage thermal treatment to obtain single phase La 0.325 Pr 0.300 Ca 0.375 MnO 3 hollow and solid structures, with external diameter determined by the sacrificial template pore size. The first thermal stage, a microwave assisted denitration process, determines the shape of the structures. The second treatment, performed at 1073K, allows to obtain the crystallographic structure of the compound. A variety of techniques (scanning and transmission electron microscopy, scanning probe microscopy) allowed to fully characterize the microstructure and morphology of these self-standing manganite nanostructures. For 1μm pore size templates we obtained tubes, with external diameter around 800nm and wall thickness around 150nm; densely packed nanoparticles sized 20–50nm are the building blocks of the walls. For pore size below 0.1μm, solid nanowires were obtained, the size of constituent crystallites being around 10nm. Overall obtained material exhibits ferromagnetic ordering below 200K.