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Scottish regiments are military units which at some point during their existence have had a form of connection with Scotland. Though the military history of Scotland dates back to the era of classical antiquity, the first organised Scottish military units were formed in the Middle Ages, mostly to serve in the Anglo-Scottish Wars or the Hundred Years' War. Numerous Scottish units also fought in the Wars of the Three Kingdoms, and during the 1660 Stuart Restoration the Scots Army was established as the army of the Kingdom of Scotland.

As a result of the Acts of Union 1707, the Scots Army was merged with the English Army to form the British Army, which contained numerous prominent Scottish regiments. Several Scottish regiments were also raised by the armies of the British Empire, including the Australian Army, Canadian Army and South African Army. Two Union Army regiments which served in the American Civil War also cultivated a "Scottish" identity. Scottish regiments often adopt elements of the culture of Scotland, including bagpipes, kilts, feather bonnets and the Glengarry.

These generally pre-date the more widely known Highland regiments (see below). The senior Lowland regiment was the Royal Scots (the Royal Regiment) which dates from 1633. The Royal Scots Fusiliers and the King's Own Scottish Borderers were subsequently raised in 1678 and 1689 respectively. Throughout the 17th, 18th and most of the 19th centuries these Scottish regiments served widely and with distinction. They did not, however, differ significantly in appearance or public perception from the bulk of the line infantry of the British Army. In 1881, the introduction of the Cardwell system of reforms provided the opportunity to adopt a modified form of Scottish dress for the Lowland regiments. Comprising doublets and tartan trews this gave the Lowlanders a distinctive identity, separate from their English, Welsh, Irish and Highland counterparts.^[1] At the same time, the absence of kilts (except for pipers) and the substitution of Kilmarnock bonnets for feather bonnets prevented confusion between Lowlanders and their Highland counterparts. The Cameronians (Scottish Rifles) was created at the same time from the merging of two existing numbered regiments.^[2]

The original Highland regiments were raised in the 18th century with the object of recruiting rank and file solely from the Scottish Highlands. However, due to the Highlands becoming extensively depopulated through the course of the 19th and 20th centuries, the Highland regiments of the British Army have witnessed a long-term decline in the proportion of recruits from the Highlands and have long recruited many Lowland Scots and others. The major 20th century exceptions to this rule were the First and Second World Wars, when many Highland men joined up. Around the time that the first Highland regiments were raised the Highlands had recently been a hotbed for several revolts against the establishment, namely the Jacobite Rebellions, so the loyalties of the Highlanders were often deemed suspect in the early history of the Highland regiments.

The first Highland regiment, the Black Watch, was originally raised from clans openly loyal to the status quo in order for the government to better police the Highlands, which were deemed to be both rebellious and lawless by the contemporary British establishment. However, due to a pressing need for personnel in North America during the Seven Years' War, William Pitt the Elder made the decision to raise new Highland regiments to fight in this global conflict. The war ended in victory and among other things, Canada was secured as a part of the British Empire, while the British East India Company's position in India was consolidated and expanded, both at the expense of the French. These Highland regiments were disbanded after the war, but other Highland regiments were raised later and, like the rest of the British Army, saw service in various wars including in the Napoleonic Wars.

By the Victorian era, the loyalty of the Highlanders was no longer suspect. Queen Victoria had a personal interest in things Scottish, in particular relating to the Highlands. In addition, Highland regiments had played a conspicuous role in such Victorian conflicts as the Crimean War and the putting down of the Indian Mutiny. The Highland regiments earned a reputation which influenced the mindset of those Scottish regiments which were Lowland in origin. This resulted in the wearing of tartan by Lowland regiments which had previously worn uniforms not clearly distinguishable from their Irish, Welsh and English counterparts. In the case of the Highland Light Infantry, the distinction between Highlanders and Lowlanders was slightly blurred: although classified as a non-kilted Highland regiment it was recruited from Glasgow in Lowland Scotland and bore the title of "City of Glasgow Regiment".

Scottish bagpipes have been adopted in a number of countries, largely in imitation of the pipers of Highland regiments which served throughout the British Empire. Highland regiments were raised in a number of Commonwealth armies, often adopting formal honorary affiliations with Scottish regiments of the British Army.

Additionally, the British Army also operate the Scottish and North Irish Yeomanry, consisting of:^[3]

The following units were formerly a part of the British Army's Highland Brigade. The brigade was amalgamated into the Scottish Division in 1968.

The following units were formerly a part of the British Army's Lowland Brigade. The brigade was amalgamated into the Scottish Division in 1968.

Former yeomanry of Scotland includes:

The Atholl Highlanders is a ceremonial Scottish regiment which not part of the British Army but under the command of the Duke of Atholl, based at Blair Castle. It was presented with colours by Queen Victoria in 1844, giving the regiment official status.^[8] It is the only legal private army in Europe.^[9]

There are presently five Scottish "Kilted Companies" in the Australian Army Reserve. They include:

• A Company, 2nd/17th Battalion, Royal New South Wales Regiment (Black Watch)
• B Company, 5th/6th Battalion, Royal Victoria Regiment (Gordon Highlanders)
• A Company, 10th/27th Battalion, Royal South Australia Regiment (Mackenzie Seaforth Highlanders)
• B Company, 16th Battalion, Royal Western Australia Regiment (Cameron Highlanders)
• B Company, 41st Battalion, Royal New South Wales Regiment (Argyle and Sutherland Highlanders)^[10]

• 30th Battalion (The New South Wales Scottish Regiment) (1915–1919; 1921–1930; 1935–1946; 1948–1960)
• 61st Battalion (The Queensland Cameron Highlanders).^[10] (1938–1946)

The Auxiliary Force maintained one Scottish regiment, the Calcutta Scottish, from 1914 to 1947.

There are 16 Canadian-Scottish infantry regiments, and one Canadian-Scottish artillery regiment in Canada's Primary Reserve. The Black Watch (Royal Highland Regiment) of Canada is the senior Canadian-Scottish infantry regiment of the Canadian Army.

Canadian-Scottish regiments in the Canadian Army Reserve:

• The Perth Regiment (1866–1965)

The New Zealand Army formerly included the New Zealand Scottish Regiment. Initially raised as an infantry regiment in January 1939, it was later converted into an armoured unit of the Royal New Zealand Armoured Corps. The unit was formally disbanded on 16 April 2016.^[11]

The South African Army has maintained several Scottish regiments with the South African Army Infantry Formation. All regiments are reserve units of the South African Army. In 2019, a number of reserve units, including the Scottish regiments, were renamed in an effort to better reflect "the military traditions and history of indigenous African military formations".^[12] These regiments include:

• Pretoria Highlanders (1939–2017)

The United States Army (or the Union Army during the American Civil War) formerly operated two Scottish regiments. One of these regiments operated as a part of the New York State Militia prior to the American Civil War. Scottish regiments formerly maintained by the United States Army includes:^[14]

• 12th Illinois Infantry Regiment (1861–1865)
• 79th New York Volunteer Infantry (1858–1876)

• Military of Scotland
• Garde Écossaise

• Quick Guide to Scottish Regiments
• Royal Regiment of Scotland | Scottish Military Heritage Centre