Mullaghanish, Mountain summit in County Cork, Ireland

Mullaghanish is a 649 m mountain in the Derrynasaggart range, just northeast of Ballyvourney in County Cork. Its summit carries a 225 m transmission mast, the tallest television transmitter in Ireland, erected in 2009.

During the 20th century, the peak was put to use for telecommunications purposes, with broadcasting equipment installed at its summit. This reflects how elevated locations became strategically important for Ireland's communications network.

The Irish name Mullach an Ois is used on maps and by locals around Ballyvourney, just southwest of the peak. The summit carries a 225 m mast erected in 2009, the tallest television transmitter in Ireland, and the mountain's name now appears in broadcasting listings alongside the Irish form.

Visitors can reach Mullaghanish via marked walking routes that begin from nearby villages and settlements. The spring and summer months provide the most suitable conditions for the climb.

Mullaghanish carries Ireland's tallest television transmitter: a 225 m mast erected in 2009 to replace the original 170 m structure. Its signal reaches counties Cork, Kerry and Limerick, and it feeds 20 relay transmitters, more than any other television site in the country.