Adelaide Hills, Hill chain in South Australia, Australia

The Adelaide Hills are a region of the southern Mount Lofty Ranges east of Adelaide, running as a long, low ridge with soft summits and shallow saddles. The crest reads hazy blue-grey above darker grey-brown lower flanks, with a flat green grassy area and a dark line of trees at the base. The largest town is Mount Barker; the wine region covers land above 300 m.

The Adelaide Hills were among the first areas of South Australia settled by Europeans after the province was declared in 1836. Woodsmen called tiersmen cut timber, then named "the Tiers", and carted it to Adelaide; the city's first East End pub, the Woodman on Grenfell Street, took its name from them. Towns such as Hahndorf and Lobethal began as German settlements, and their names and architecture still show it.

Hahndorf and Lobethal began as German settlements, and their town names and architecture still show it. Lutheran churches and Lutheran schools, some teaching German, serve descendants of those settlers, and older residents still speak German. The Lobethal Christmas lights, started in the 1950s, continue as a local custom.

The hills begin within 20 km of most Adelaide suburbs, and the Heysen Tunnels on the South Eastern Freeway, completed in 1999, shortened the drive east. Only one railway crosses the range, the Adelaide–Melbourne line; commuter trains stopped at Belair in 1987. Mount Lofty has a lookout, a restaurant and the fire-spotting tower once run by the Country Fire Service.

The National Motor Museum in Birdwood hosts an annual parade where thousands of vintage vehicles travel through the hills in a procession. This gathering ranks among the world's largest and longest-running classic car events, drawing collectors and enthusiasts from around the globe.