A magnitude-7.7 earthquake struck Balochistan in British India, now part of Pakistan, killing between 30,000 and 60,000 people.

An earthquake occurred on 31 May 1935 between 2:30 am and 3:40 am at Quetta, Baluchistan Agency, close to the border with southern Afghanistan. The earthquake had a magnitude of 7.7 M_w  and anywhere between 30,000 and 60,000 people died from the impact. It was recorded as the deadliest earthquake to strike South Asia until 2005. The quake was centred 4 km south-west of Ali Jaan, Balochistan, British India.

Baluchistan was a chief commissioners province of British India established in 1876. Upon the creation of Pakistan it acceded to the newly formed state. It was part of the Baluchistan Agency. It was dissolved to form a united province of West Pakistan in 1955 upon the creation of One Unit Scheme.

The British Raj was the colonial rule of the British Crown on the Indian subcontinent, lasting from 1858 to 1947. It is also called Crown rule in India, or direct rule in India. The region under British control was commonly called India in contemporaneous usage and included areas directly administered by the United Kingdom, which were collectively called British India, and areas ruled by indigenous rulers, but under British paramountcy, called the princely states. The region was sometimes called the Indian Empire, though not officially. As India, it was a founding member of the League of Nations and a founding member of the United Nations in San Francisco in 1945. India was a participating state in the Summer Olympics in 1900, 1920, 1928, 1932, and 1936.