• Branches: Davidson of Cantray, Davidson of Tulloch..
• Badge: A stag's head erased Proper
• Motto: Sapienter si sincere (Wisely if sincerely)
• Gaelic Name: MacDhaibhidh
• Septs: Davey, Davie, Davis, Davison, Dawson, Day, Dea, Dean, Deane, Deas, Deason, Dey, Dow, Dye, Kay, Keay, Key, Keys, MacAdie, MacDaid, MacDavid, MacKay, Slora, Slorach.

The Clan began in the early 14th century with Donald, 3rd son of Robert Comyn and the grandson of the Comyn killed by the Bruce at Dumfries, married the daughter of the MacKintosh chief. The name of the Clan comes from their son, David. His family and followers being known as Clan Dhai as the name Comyn was proscribed around 1320.

The Davidsons were almost wiped out at the Battle of Inverhaven in 1370. They followed the MacKintoshes and others of Clan Chattan against the Camerons who had invaded Badenoch. A dispute arose between the Davidsons and MacPhersons over the right to command. When the MacKintoshes supported the Davidson side, the MacPhersons left the field. 

The Camerons exploited the chaos and virtually destroyed the Davidsons. The MacPhersons did eventually take the field and routed the Camerons.

By the 16th century the name Davidson had spread from Aberdeen to Ayr. There was a family of Davidsons at Samuelston in the Borders and the name Davidson can be found along with the Elliots and Turnbulls as wild and unruly Clans.

Duncan Davidson, Lord Lietenant of Ross-Shire, was a favourite of Queen Victoria whom he used to visit regularly when she visited Balmoral.

A direct descendant of the Davidsons of Tulloch, now living in New Zealand, is seeking to matriculate the arms in the Court of the Lord Lyon and claim the chiefship.

The Scottish Tartan Society Lists five different tartans for clan Davidson. The one in the left margin is listed as  "Davidson of Tulloch" and is tartan #1360.  The tartan behind the clan badge above is listed as Clan Davidson and is tartan #1364.