1918 flu pandemic in India was the outbreak of an unusually deadly influenza pandemic in India between 1918 and 1920 as a part of the worldwide Spanish flu pandemic. Also referred to as the Bombay Influenza or the Bombay Fever in India, the pandemic is believed to have killed up to 17 – 18 million people in the country, the most among all countries. David Arnold (2019) estimates at least 12 million dead, about 5% of the population. The decade between 1911 and 1921 was the only census period in which India’s population fell, mostly due to devastation of the Spanish flu pandemic. The death toll in India's British-ruled districts was 13.88 million.