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This work investigates the electronic momentum density (EMD) distribution in nanosize zirconia (ZrO2) using the technique of Compton scattering. The ZrO2 nanoparticles (11.2 nm) are synthesized of mechanical milling and characterized by SEM, XRD and TEM probes. The Compton profile J (p z) of nanoZrO2 is measured by Compton spectrometer 59.54 KeV Gamma rays (Americium-241) source. The study finds out that EMD in nanoZrO2 is narrower comparing in case bulk ZrO2. This study adopts the ionic-model-based free atom J (p z) calculation for many configurations (Zr) + x (O − x ∕ 2 )2 (0. 0 ≤ x ≤ 0. 2) to measure the charge transfer (CT) on the compound formation. According to this study's findings, CT values in these materials are ranged from 1.5 to 1.0 electrons from Zr to O atom. [ABSTRACT FROM AUTHOR]