This data folder corresponds to the study of the electrochemical behavior of LaMnO3 oxide nanoparticles synthetized at different temperatures towards the oxygen reduction reaction. The folder contains the following subfoderls, according to the figure of the paper they belong to: Figure 1: XRD patterns of LaMnO3-600C, LaMnO3-650C,LaMnO3-700C, LaMnO3-800C, LaMnO3-850C, LaMnO3-900C and LaMnO3-950C (seven .csv files). Figure 2: EXAFS spectra obtained at the Mn K-edge. The data shared is a merge of three different collected spectra and has already been aligned. Different files for LaMnO3-600C, LaMnO3-650C,LaMnO3-700C, LaMnO3-800C, LaMnO3-850C, LaMnO3-900C and LaMnO3-950C samples (seven .csv files). Figure 4: raw XPS spectra collected for LaMnO3-600C, LaMnO3-650C,LaMnO3-700C, LaMnO3-800C, LaMnO3-850C, LaMnO3-900C and LaMnO3-950C (seven .csv files). Figure 5: cyclic voltammograms recorded in a 0.1 M KOH solution at 0.01 V per second. Different files for LaMnO3-600C, LaMnO3-650C,LaMnO3-700C, LaMnO3-800C, LaMnO3-850C, LaMnO3-900C and LaMnO3-950C samples (seven .csv files). Figure 6: linear sweep experiments obtained in a rotating ring-disk set-up at 1600 rpm in an oxygen saturated 0.1 M KOH solution. Different files for LaMnO3-600C, LaMnO3-650C,LaMnO3-700C, LaMnO3-800C, LaMnO3-850C, LaMnO3-900C and LaMnO3-950C samples (seven .csv files). No particular software is needed for the analysis of the data. Full citation: Mean Instrinsic Activity of Single Mn Sites at LaMnO3 Nanoparticles Towards the Oxygen Reduction Reaction Veronica Celorrio, Laura Calvillo, Celeste van den Bosch, Gaetano Granozzi, Ainara Aguadero, Andrea Russell, and David J. Fermín ChemElectroChem