Brendan McWilliams (7 August 1944 – 22 October 2007) was an Irish meteorologist and science writer. He was born in Dublin in 1944 but grew up in Waterville, County Kerry where his father was in charge of the Valentia Observatory. He graduated in mathematical science from University College Cork (UCC) in 1964. He joined the Irish Meteorological Service in 1965 and worked as a weather forecaster, first at Shannon Airport and later at the Central Analysis and Forecast Office in Dublin. During the 1970s he was a regular presenter of the daily weather forecast on Raidió Teilifís Éireann (RTÉ) television.