Thyroid storm (TS) is a rare, life-threatening health condition associated with undertreated hyperthyroidism. During a TS, individual vitals can soar to dangerously high levels, and without prompt, aggressive management, a TS can be fatal. Diabetic ketoacidosis (DKA) is a trigger for thyroid crisis. However, TS and DKA rarely occur simultaneously. Here, we are presenting a case of TS having coronavirus disease 2019 (COVID-19) at admission, complicated with DKA. However, it has been seen that TSs can precipitate DKA in a few instances. Case description: A 72-year-old female with a history of diabetes mellitus (DM) was brought to the emergency room with symptoms of recurrent DKA. She was COVID-19-positive at the time of admission but with minimal upper respiratory symptoms. DKA protocol was started according to our hospital policy, but she developed tachycardia, a high fever, and a disturbing level of consciousness. After laboratory investigations revealed disturbing thyroid functions. So, DKA with TS was diagnosed. Antithyroid medication, inorganic iodine, and corticosteroids were then started as a treatment for TS, and β-blockers were administered to manage tachycardia. With these treatments, the patient's health improved, and she recovered. Conclusion: In severe cases of DKA, sometimes the presence of TS can be considered, and early treatment should be initiated before the patient's condition worsens.