Kalka is an Aboriginal community in the Anangu Pitjantjatjara Yankunytjatjara Lands in South Australia administered under the Anangu Pitjantjatjara Yankunytjatjara Land Rights Act 1981.

At the 2016 Australian census, Kalka had a population of 92. The community uses many of the facilities at nearby Pipalyatjara.

Due to its links with the Northern Territory and proximity to the border, the APY Lands do not observe daylight savings, unlike the rest of South Australia. The time zone observed throughout the year is Australian Central Standard Time (UTC+9:30), in line with Darwin rather than Adelaide.

Kalka is situated in the far northwest of South Australia, right alongside the Gunbarrel Highway. The Kalka community is just kilometres from the Surveyor-General's Corner (the intersection of the South Australia, Western Australia and Northern Territory borders). The community of Pipalyatjara is situated 15 kilometres away by road, on the south side of the mountain ridge of which Kalka sits on the north. Kalka is situated at the foot of the Tomkinson Ranges.

Based upon the climate records of the Giles Weather Station, which is across the border and slightly to the northwest in Western Australia, Kalka experiences summer maximum temperatures of an average of 37.2 degrees Celsius in January and a winter maximum average temperature of 19.9 degrees Celsius in July. Overnight lows range from a mean minimum temperature of 23.5 degrees in January to 6.8 degrees in June.

Annual rainfall averages 284.2 millimetres.

At the 2016 Australian census, Kalka had a population of 92. The median age was 25 years old.

Fifteen years earlier, the 2001 Australian Census indicated a total population of 139, with 90.6% being Indigenous Australians.