Belair is a suburb in the south eastern foothills of Adelaide, South Australia at the base of the Mount Lofty Ranges.

At the 2021 census, Belair had a population of 4,896, up from 4,411 at the 2016 census and 4,390 at the 2011 census. Only 26 people identified themselves as Aboriginal and/or Torres Strait Islander people, making up just half a percent of the suburb’s population, well below the national average of 3.2%. Belair is also an older suburb, with a median age of 47 compared with the national median age of 38. 89.6% of people only spoke English at home, and 75.0% reported that they were born in Australia. These were the most commonly nominated ancestries:

The Adelaide-Wolseley railway line runs through Belair, with the Pinera and Belair railway stations being serviced by the Belair railway line, operated by Adelaide Metro.