Fergus Lethderg ("red-side" or even "half-red"), the boy of Nemed who leads his people against a Fomorians in the Irish Mythological Cycle Fergus mac Róich, a character from either a Ulster Cycle of Irish mythology Fergus Fortamail, legendary High King of Ireland of the 4th century BC Fergus Dubdétach, legendary High King of Ireland of the 3rd century AD Fergus, boy of Eochaid Mugmedon, half-brother of Niall of the Nine Hostages (5th century) Fergus I of Dalriada, a Scottish king of the 6th century Fergus II of Dalriada, a Scottish king of the 8th century Fergus Hume, novelist Fergus Ewing, Scottish politician Fergus McDuck, a Walt Disney character

Pages known as Fergus include:

Fergus, Ontario, Canada Fergus County, Montana Fergus Falls, Minnesota Fergus Falls Township, Minnesota Newmarket-on-Fergus, a town inside Ireland