Earl of March is a title that has been created several times, respectively, in the Peerage of Scotland and the Peerage of England. The title derives from the "marches" or borderlands between England and either Wales (Welsh Marches) or Scotland (Scottish Marches), and it was held by several great feudal families which owned lands in those districts. Later, however, the title came to be granted as an honorary dignity, and ceased to carry any associated power in the marches.

The Scottish earldom is extant in its own right, and it is held by James Charteris, 13th Earl of Wemyss and 9th Earl of March.

The English earldom is today the main non-ducal subsidiary title of the Duke of Richmond. The current duke's eldest son, named Charles like his father, enjoys it as a courtesy title.

The Earls of March on the Scottish border were descended from Gospatric, Earl of Northumbria, but being soon afterwards deprived of this position he fled to Scotland, where Máel Coluim III, King of Scotland, welcomed him and granted him Dunbar and the adjoining lands. His successors controlled the Marches, but Earl of March was only assumed as an alternative title to that of Earl of Dunbar by Patrick de Dunbar, 8th Earl of March. The last of his successors was George de Dunbar, 11th Earl of March and Dunbar, whose honours and lands were forfeited to the Crown. He retired to England and died in obscurity.

Following his forfeiture, the next creation of the Earldom of March was for Alexander Stuart, Duke of Albany. At the death of his successor John, the dukedom and earldom became extinct. The next creation was for Robert Stuart, but at his death, the earldom again became extinct.

The most recent Scottish creation of the Earldom of March was in 1697 for Lord William Douglas, second son of the William Douglas, 1st Duke of Queensberry. He was also created Lord Douglas of Neidpath, Lyne and Munard, and Viscount of Peebles, with remainder to heirs male of his body, failing which to his other heirs male and of tailzie. He was succeeded by his son, also William, who married Anne Douglas-Hamilton, 2nd Countess of Ruglen. They were both succeeded by their son, another William, who became 3rd Earl of March and 3rd Earl of Ruglen.

In 1768 the third earl was created Baron Douglas of Amesbury, and in 1778 he succeeded his first cousin twice removed, Charles Douglas, 3rd Duke of Queensberry, as fourth Duke of Queensberry. The duke died childless in 1810, however, and his titles were inherited by several different individuals. The earldom of Ruglen and barony of Douglas of Amesbury became extinct. The dukedom of Queensberry was inherited by his second cousin once removed, Henry Scott, 3rd Duke of Buccleuch (see the Duke of Buccleuch for later history of this title). The marquessate and earldom of Queensberry passed to his kinsman Sir Charles Douglas, 5th Baronet (see the Marquess of Queensberry for later history of these titles). The earldom of March and its two subsidiary titles were inherited by his second cousin once removed Francis Wemyss-Charteris, later the eighth Earl of Wemyss.

See Earl of Dunbar, for which "Earl of the March" is used as an alternate title