Lock is a town in the centre of Eyre Peninsula in South Australia. It is central Eyre Peninsula's main grain storage hub, as it is surrounded by a predominantly farming community, with emphasis on cereal crop production. The town has a hotel, caravan park, motel, supermarket, post office, police station, sporting complex, golf and bowling clubs and area school. At the 2006 census, Lock had a population of 290.

Although many nearby coastal towns were settled much earlier, Lock was not established until the 1860s due to the low rainfall and marginal conditions. Early settlers grazed sheep on vast tracts of natural vegetation for very low costs. Land settlement occurred in 1861, with settlements continuing further north over the next decades.

A major change occurred in the area with the arrival of the Port Lincoln railway line in 1913. The area was serviced by a siding known simply as Terre Siding after one of the local properties. This was altered when the town was gazetted in February 1918, and named Lock after Corporal Albert Lock, a member of the South Australian Survey Department who had been killed in Belgium during World War I, in 1917.

The potential for wheat cropping was realised with the establishment of the railway, but the low rainfall kept any developments from happening until the pipeline from the Tod Reservoir was connected. Two years later, a huge underground water reservoir was discovered under the town, capable of supplying all of the town's water needs.

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