Glenelg is a popular beach-side suburb of the South Australian capital of Adelaide. Located on the shore of Holdfast Bay in Gulf St Vincent, it has become a popular tourist destination due to its beach and many attractions, home to several hotels and dozens of restaurants.

Established in 1836, it is the oldest European settlement on mainland South Australia (the oldest is Kingscote on Kangaroo Island). It was named after Lord Glenelg, a member of British Cabinet and Secretary of State for War and the Colonies.

Through Lord Glenelg the name derives from Glenelg, Highland (previously Inverness-shire), Scotland. In Scottish Gaelic the name is Gleann Eilg. The name Glenelg is noteworthy for being a palindrome.

Prior to the 1836 European settlement of South Australia, Glenelg and the rest of the Adelaide Plains was home to the Kaurna group of Indigenous Australians. They knew the area as "Pattawilya" and the local river as "Pattawilyangga", now named the Patawalonga River. Evidence has shown that at least two smallpox epidemics had killed the majority of the Kaurna population prior to 1836. The disease appeared to have come down the River Murray from New South Wales.

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