These castles were built or owned by the MacDougalls at one time or another. Some estates are in ruins now, and beyond repair. However Dunollie Castle; the seat of the clan is currently getting some attention from Historic Scotland.
- Dunollie Castle is situated on the northern outskirts of Oban. A small ruin surrounded on three sides by the sea. It is in one of these locations that probably always housed a strong point or lookout tower since man started fearing his fellow man. There is evidence of a fortification there in the sixth century. Parts of the north curtain wall (dating from 1150) and the Keep are mainly all that remain today, apart from the odd outlines bulging in the undergrowth.
- Dunstaffnage Castle is located 5 miles to the north of Oban. The rough outside walls were part of the MacDougall build in the mid 12th century. The castle was captured by Robert the Bruce when he took his revenge following the battle at the Pass of Brander in 1308. As a Royal Castle, now, it was given into the care of the Campbells. In the 15th century it was enlarged at the orders of King Alexander 2nd. In 1810 it was ruined by a great fire.
- Duntrune Castle is located on the north shore of Loch Crinan, just to the north of the village of Crinan in Argyll. Originally built by the Clan MacDougall in the 12th century it was taken by the Campbells. The enclosure wall is 6 foot thick and approximately 25 foot high and dates from the 13th Century the tower house dates from the 16th century when under the MacCallum ownership. It was again restored in the late 18th century and modernised in 1954. The Malcolm family moved out to their newly built Poltalloch House in 1853 but returned to Duntrune after 1954 where they still reside today. The castle is not open to the public, the family earns income from holiday vistors on the estate.
- Aros Castle on the Sound of Mull is another built in the 12th century and captured for the Crown by Robert the Bruce two hundred years later. After which times it changed hands from MacDonalds to Macleans and eventually to the Campbells who allowed it to fall into ruin in the late 17th century.
- Cairnburgh Castle is located on the Treshnish Isles northwest of Mull. Not much of it's early history is known but it was noted as held by Ewan MacDougall in 1249. To all accounts this castle was in an unassailable position but the down-side would then be it was hard to replenish. Believed captured by The Bruce and it certainly featured large in the MacLeans history later.
- Dunchonnel and Coeffin were also both taken by Bruce.
- Gylen Castle on the island of Kerrera was a new addition being built in 1587 during a good period for the clan. Although this was to be short lived the castle was destroyed by Covenanters during the civil war by General Leslie in 1647.
- Castle Stalker situated on Loch Laich mid-way between Oban and Glencoe. Was originally built by the clan in 1320. Although it was to pass to the Stewarts along with the title The Lordship of Lorn around 1388.
- Ardchattan Priory, six miles north of Oban, was founded in 1230 by Duncan MacDougall. It is now a ruin and a site where the MacDougall chiefs were buried up until 1737.