Ballyannan Castle lies south west of the town of Midleton, in County Cork in Ireland.
The first building at this site was probably a castle owned by the Hodnett family. In 1653 a Sir John Broderick, a Cromwellian settler, took possession of the estate and rebuilt the castle into a fortified Tudor mansion. It are the remains of this mansion that we see today.
By 1752 the Brodericks had left Ballyannan Castle and were managing their lands through agents. In 1782 the Ballyannan Castle estate was still owned by the Brodericks, in the person of George Broderick, the 4th Viscount Midleton.
By 1837 the castle was said to be in ruins. The estate, which managed the Ballyannan Woods, closed in 1964.
Ballyannan Castle consists of a rectangular block, of 3 bays long and 2 storeys high, with a rectangular projection near the centre of the west wall and circular towers, with gun loops at ground floor level, at 2 corners.
At present the remains of Ballyannan Castle are situated on the grounds of a local farm, so not accessible. A nice ruin.