Critical care nephrology is a specialized field of medicine that focuses on the management of acute kidney injury (AKI) and renal complications in critically ill patients. The kidneys play a crucial role in maintaining fluid and electrolyte balance, as well as eliminating waste products from the body. In critically ill individuals, factors such as sepsis, shock, and other systemic insults can lead to rapid and severe dysfunction of the kidneys, necessitating specialized care. Critical care nephrologists collaborate closely with intensivists and other healthcare professionals to monitor renal function, implement interventions to support kidney function, and address the complex interplay between the kidneys and other organ systems. Continuous renal replacement therapy (CRRT), hemodialysis, and other renal support modalities are frequently employed in the critical care setting to manage severe cases of AKI. The field of critical care nephrology strives to optimize outcomes for patients facing acute renal challenges in the context of critical illness, emphasizing a multidisciplinary approach to address the intricate connections between systemic conditions and renal function.