Clan Graham (Greumaich nan Cearc [ˈkɾʲeːmɪç nəŋʲ ˈkʲaɾʃc]) has two main families of Scottish clans, the Grahams of Menteith (descended from the Earl Of Menteith) and the Grahams of Montrose (descended from the Duke of Montrose). Each have their own tartan patterns. William Graham became the 7th Earl of Menteith in 1610 in what is now Perthshire, Scotland. The Grahams of Montrose had territories in both the Scottish Highlands and Lowlands, and the chief of the clan rose to become the Marquess and later Duke of Montrose.

There is a tradition that the first Graham was one Greme who broke the Roman Antonine Wall driving the Roman legions out of Scotland. However the likely origin is that the chiefs of Clan Graham were of Anglo-Norman origin. The Manor of Gregham is recorded in William the Conqueror's Domesday Book. When David I claimed the throne of Scotland, Graham was one of the knights who accompanied him. Sir William de Graham was present at the erection of Holyrood Abbey, witnessing its foundation charter.

The first lands that the chiefs of Clan Graham appear to have held were around Dalkeith in Midlothian. Sir Nicholas de Graham attended the Parliament of 1290 where the Treaty of Birgham was signed.

The Clan Graham fought at the Battle of Dunbar in 1296 where Sir Patrick de Graham of Kincardine was the only man of all the Scots not to retreat and instead fought to the death.

Sir John de Graham, was a friend and follower of William Wallace. Sir John de Graham is regarded as hero for rescuing Wallace at Queensbury. Sir John de Graham was regarded as Wallace's right-hand man and Wallace was at his side when Graham was killed in 1298 at the Battle of Falkirk. John de Graham's name is still perpetuated in the district of Grahamston. The grave of Sir John de Graham in Falkirk churchyard is still to be seen, with table stones of three successive periods above it. One great two-handed sword of Sir John the Graham is preserved at Buchanan Castle by the Duke of Montrose. Another was long in possession of the Grahams of Orchil and is now treasured by the Freemason Lodge at Auchterarder.

The Clan Graham also fought against the English at the Battle of Durham in 1346, in support of King David II of Scots. The Grahams acquired the lands of Mugdock north of Glasgow, where they built a stout castle around 1370.

In John Stewart's book, The Grahams, he states that "Most Scottish Clans would be proud to have one great hero. The Grahams have three." He refers to Sir John de Graham, the Marquis of Montrose and the Viscount of Dundee. Stewart also wrote,

It is remarkable that the early Grahams were one and all exceedingly capable men. In an age when the reputation of many great public figures, alas, that of most of the Scottish nobility, were sullied by deeds of violence, and often deeds of blackest treachery, it is refreshing to find that the Grahams stand out as loyal and true to the causes they espoused. Their story is not one of rapid rise to power through royal favor, or even at the expense of their peers, but rather a gradual steady rise based on their undoubted ability and worthiness which seems to have endured from one generation to another.