Proinsias Mac Aonghusa (English: Francis McGuinness; 23 June 1933 – 28 September 2003) was an Irish journalist, writer, tv presenter and campaigner.
Mac Aonghusa was a broadcaster for Radio Éireann in 1952, and for RTÉ, UTV and BBC television from the 1960s.
In 1962, he won a Jacob's Award for his Irish language broadcasting on RTÉ television.
He ran for election as a candidate of the Irish Labour Party, and became vice-chairman of the party.
He encouraged the formation of the Young Labour League and edited and wrote an introduction to Corish Speaks, a collection of speeches by Brendan Corish, who was then leader of the party.
He became involved in the republican Wolfe Tone Society in late 1966, and he was expelled from the Labour Party on 12 January 1967 for "activities injurious" to the party.
He ran as an independent candidate in 1969, but thereafter became more concerned with the revival of the Irish language and with nationalist politics.