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In this research, the effect of PVP on magnetic properties and morphology of Fe 3 O 4 nanoparticle (Fe 3 O 4 -NP S ) is investigated. Also, the sensitivity of the humidity of the selected Fe 3 O 4 -NP S is studied. X-ray diffraction (XRD), transmission electron microscope (TEM), and vibration sample magnetometer (VSM) were used to characterize the synthesized Fe 3 O 4 -NPs. The XRD and TEM results demonstrated that Fe 3 O 4 -NPs were crystallized in cubic structure with spherical pores morphology. Superparamagnetic behavior was seen in the samples prepared with the maximum saturation of approximately 10 emu g −1 for the sample synthesized using PVP:Fe(ac ac) 3 ratio equal to 4. The outcomes of the humidity sensing of the selected sample revealed that the prepared Fe 3 O 4 -NPs with a porous structure is a good candidate to be used for humidity sensing.