Mullaghanish (/ˌmʌlɪɡənˈɪʃ/; Irish: Mullach an Ois) is a 649 m high mountain in the Derrynasaggart range, located just northeast of Ballyvourney in County Cork, Ireland.

This site is home to one of Telefís Éireann's original five main television transmitters.

Coming on air in December 1962, initially on low power, it was in full operation by September 1963 with a 625-line VHF service for the Southwest of Ireland, namely counties Cork, Kerry and Limerick.

Analogue television transmissions from this site ended on 24 October 2012, and the national DTT service, Saorview, is now broadcast from Mullaghanish at an ERP of 200 kW, making this the most powerful television transmitter in all of Ireland, a distinction formerly attributed to the Cairn Hill (analogue) transmitter in County Longford.

As well as digital television, six national FM radio services are broadcast from the site, all using vertical polarisation.