Solution processed homogeneous (200) oriented MgO ∼85 nm thin films deposited on Si substrates were fabricated by inkjet printing. These films are found to show ferromagnetic order beyond room temperature with a saturation magnetization MS as high as ∼0.63 emu/g for the acid ink precursor. X-ray photoelectron spectroscopy investigations show the absence of any possible contamination effects, and confirm that the role of defect structure at the Mg site forming in acid condition is important for the observed magnetism.