Light is a single-member electoral district for the South Australian House of Assembly. Light is named after Colonel William Light (1786 – 1839), who was the first Surveyor-General of South Australia. The electorate was created in 1857, abolished at the 1902 election and recreated at the 1938 election. It is based on the semi-rural township of Gawler, and stretches southwards into the outermost northern suburbs of Adelaide.