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The achievement of a successful heating power response of Fe 3 O 4 nanoparticles for being applied in magnetic hyperthermia entails an exhaustive control of their magnetic characteristics and therefore, of the synthesis method employed. Despite the fact that one of the best wet-chemical methods to finely adjust Fe 3 O 4 nanoparticles (NPs) size over 15 ​nm is the thermal decomposition of iron(III) oleate, the studies about the specific influence of iron(III) oleate precursor on the IONPs are particularly scarce. So, in this work five iron(III) oleate precursors have been systematically prepared varying synthesis conditions and it has been analyzed how their characteristics affect the features of the ulterior magnetite NPs. The refined synthesis method has yield monophasic and monodisperse NPs of magnetite (Fe 3 O 4) with different sizes (in the 10–40 ​nm range) and morphologies (cuboctahedral, octahedral and spherical). A complete chemical, structural, morphological and magnetic characterization have been performed to correlate the properties of the iron(III) oleate with the features of the subsequent magnetite NPs. [Display omitted] • A proper control of the reaction conditions of Fe(oleate) 2 precursor can lead tailored magnetic nanoparticles. • Well-faceted nano-octahedra Fe 3 O 4 nanoparticles, with good shape/size homogeneity can been obtained from Fe:Oleate ratio ≤3. • High saturation magnetization (Ms) and a Verwey temperature (Tv) similar to bulk magnetite displayed by octahedral NPs. • Good monodispersity of octahedral nanosystems easily corroborated by EMR measurements. [ABSTRACT FROM AUTHOR]