No, Aberdeen shire is not considered to be part of the Scottish Highlands.
Northwest highlands
The northern part of Scotland is commonly referred to as the Scottish Highlands.
In Scotland, mostly highlands and islands. I often see a few on my walks.
Scottish Highlands and Islands, particularly West Highlands
The Scottish Highlands The Cambrian Mountains The Pennines
The Scottish Highlands is a region in Scotland that covers most of the northern part of the country, rather than a specific city or town. It is known for its stunning landscapes, rugged terrain, and historic sites.
The three main mountain ranges in the UK are the Scottish Highlands in Scotland, the Cambrian Mountains in Wales, and the Pennines in England.
The mountainous area of Scotland is known as 'The Highlands'. The Highlands include the Cairngorm and Grampian ranges. Ben Nevis, the highest mountain in the UK is in the Highlands, as is Loch Ness. The highest village in the UK, Tomintoul, is also in the Highlands.
The Highlands of Scotland are a part of the Scottish nation, so therefore belong to the Scottish state and it's people. However, there are many large estates and game-reserves in the Highlands that are private land, although some of these allow walkers the right to cross through them.
The Highlands are in the northern half of Scotland.
The Highlands geographically, start at Stonehaven in Aberdeenshire.