Glenelg is a popular beach-side suburb of the South Australian capital of Adelaide. Located on the shore of Holdfast Bay in Gulf Saint 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 being Kingscote on Kangaroo Island), with the proclamation of the colony of South Australia. 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.