The famous nurse known for her work during the Crimean War is Florence Nightingale. Often regarded as the founder of modern nursing, she gained recognition for her role in improving unsanitary conditions and inadequate medical care in military hospitals during the war (1853-1856). Nightingale's meticulous statistical analyses demonstrated the impact of sanitation on health outcomes, leading to reforms in hospital hygiene practices. Her efforts also advanced nursing as a respected profession and established formal training programs. Nightingale's legacy continues to influence nursing and public health practices worldwide.