Functional oxides have been very ingeniously used for diverse applications, recently in biomedical applications. Among the functional oxides, zinc oxide nanoparticles (ZnONPs) have proven to be exceptional for biomedical applications. Chitosan (CS), alginate (Alg) and polyethylene glycol (PEG) have been explored in the synthesis of ZnONPs as potential capping agents for hyperthermia applications. X-rays diffraction (XRD), UV-visible spectroscopy, scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR) and Vibrating sample magnetometry (VSM) techniques have been used to analyze the crystallinity, absorbance, morphology and magnetic properties of the samples, respectively. In our research described here the hyperthermia analyses of ZnONPs and PEG, CS and Alg capped ZnONPs were conducted under an applied field of 180 Oe. The results indicated that the samples could reach elevated temperatures that fall within the therapeutic range. A high specific absorbance degree (SAR) was obtained for the capped samples when compared with the pristine sample, making them more suitable for hyperthermia applications.