Rostellan (Irish: Ros Tialláin) is a civil parish, townland and village in the historical Barony of Imokilly, County Cork, Ireland.

[1][2] An electoral division of the same name forms part of the Cork East Dáil constituency.

[7][9] The folly, "Siddons Tower", was built in the 1770s by Murrough O'Brien, 1st Marquess of Thomond on the grounds of his estate.

[13] In A Topographical Dictionary of Ireland, published by Samuel Lewis in 1837, Rostellan Castle is described as an "elegant mansion", with its "highly cultivated and extensive demesne" spanning one-third of the parish.

[16][17] Aghada GAA club, founded in 1885, has its main sports ground on Rostellan promontory.