Farnell Castle is an oblong tower house dating from the late 16th century four miles south of Brechin, Angus, Scotland.

It was turned into a secular castle by Catherine, Countess of Crawford.

[1] The castle is a three-storey structure, built from rubble and slate.

One has the initial M, and a crown above; the other I.M., thought to stand for ‘Jesu Maria’[3] There is a circular stair tower in front.

[1] There is ruined rectangular lean-to dovecot with rubble walls supported by later buttressing in the castle grounds.