Electron paramagnetic resonance (EPR) and Optical absorption spectra of vanadyl ions in calcium oxalate monohydrate single crystals have been studied. EPR spectrum at room temperature exhibits an isotropic octet spectrum. The detailed EPR analysis indicates that vanadyl ions exhibit liquid like behaviour. EPR spectrum has been studied at different temperatures. It is found that at 255 K, the EPR spectrum completely disappears. The optical absorption spectrum exhibits three absorption bands characteristic of vanadyl ions in tetragonal symmetry. From the optical data, the crystal field and tetragonal parameters have been evaluated.