|Motto||No fish we can't catch, No tower we can't climb, No river we can't cross|
|Local authority||Aberdeen City Council|
|Age||11 to 18|
|Houses||Auchindoun, Crathes, Esslemont, Fyvie|
|Colour(s)||Purple, blue and silver|
Oldmachar Academy is situated in Bridge of Don in the north of Aberdeen in an area of private housing. It is a six-year comprehensive, non-denominational school which opened to pupils in August 1982 (April 1983 on its present site). In 2004 it was ranked in the top 50 Secondary Schools in Scotland.
The school consists of seven blocks built to form an irregular quadrangle, with playing fields to the north of the school. The school buildings have often been a target for vandals, with 140 incidents recorded between 2016 and 2019. 
The school receives Primary 7 pupils from the 5 associated Primary schools in its 'Associate Schools Group'. These schools are:
- Danestone Primary School
- Forehill Primary School
- Glashieburn Primary School
- Greenbrae Primary School
- Middleton Park School
The current head teacher is Judith Mohamed, who took over in 2014 from Derek Brown.
The school has a capacity of 1,104 pupils. The school roll has gradually fallen over the years, with figures from Aberdeen City Council listing a roll of 852 in 2012, dropping to 656 in 2018, before being forecast to rise slightly in 2020. 
The school has a tradition of promoting healthy eating among its pupils, including limiting the amount of fried food available in the canteen. The then-Rector Joseph Leiper took part in a Scotland-wide inquiry into healthy eating in schools in 2004. He was made an OBE for services to education in that year's New Year's Honours list.
As of 2009, there are seven classes in each year group (A to G) except S1 which has six classes. There are four school houses, each named after a local Scottish castle beginning with the letter of the six corresponding classes. "G" does not have its own house due to there not being enough pupils and the absence of a first year "G" class, so they are split into the other houses by year.
The houses are:
Notable former pupils
- Scott Booth, footballer
- Neil Fachie, Paralympic medal-winning cyclist
- Norman Macleod, journalist and news presenter (attended Oldmachar for two years)
- Scott Michie, footballer
- Gavin Rae, footballer
- Dennis Wyness, footballer
- "Roll Forecast Oldmachar Academy Schools Group" (PDF). Aberdeen CityCouncil. Retrieved 10 April 2019.
- Wyllie, James. "Dismay as 'idiots' cost councils £800,000 by trashing north and north-east public buildings". Press and Journal. Retrieved 4 March 2020.
- "Roll forecast Oldmachar Academy" (PDF). Aberdeen City Council. Retrieved 4 March 2020.
- "Fruit bar kids kill the stodge". Tes. Retrieved 4 March 2020.
- "'Ban rogue chip vans'". Tes. Retrieved 4 March 2020.
- MacLeod, Donald (31 December 2003). "Knighthoods for school and college heads". The Guardian. ISSN 0261-3077. Retrieved 4 March 2020.