It is the first time that gallium oxide has been used to study its medicinal effect on alloxan-induced diabetes in male rats. Diabetes is a hyperglycemic metabolic condition caused by defects of insulin secretion and function. The two effects of chemical products and herbal medicine in the treatment of diabetes have been examined in many studies. The objective of the present study is to examine the effects of Gallium oxide nanoparticles GaONPs on some complications such as serum glucose, insulin levels, lipid profil, liver and kidney function, and thyroid gland in normal diabetic rats, induced with alloxan. For this experiment, thirty stable adult male Albino rats weighing 275 ± 25 gr are taken. Rats are divided into three groups (10 rats in each group). Animals are treated for 30 days by a gavage tube as follows: category I: non-diabetic control rats; group II: diabetic control rats; group III diabetic rats which received GaONPs 0.3 ml per day. At the end of the 30 days, blood samples are collected and biomedical parameters are determined using commercial assay kits in all the study groups. The findings of the present study have demonstrate that there a significantly reduction in glucose serum levels, insignificant elevation of insulin levels, amelioration in serum lipid fractions, decrease in serum levels of liver enzymes ALT, AST, significant reduction in levels of urea and creatinine, and insignificant elevation in the T3, T4 hormones. It may be proposed, according to the present findings, that the anti-hyperglycemic effect of GaONPs is at least partially mediated by amelioration according to all the parameters mentioned above. These results are definite supporting GaONPs as a new medicine for diabetic patients.