Denis Moynihan (b Rathmore, County Kerry 16 June 1885; d Tralee 5 December 1975) was an Irish Roman Catholic bishop.

Moynihan was educated at St Brendan's College, Killarney. He trained for the priesthood at the Irish College in Paris. Moynihan served curacies at St Hugh of Lincoln, Wavertree;St James, Bootle;St Cronan, Caherdaniel; and St John, Tralee. He joined the staff of St Mary's Cathedral, Killarney in 1922; and became its administrator in 1928. He was Bishop of Ross from 1941 until 1952 when he was transferred to Kerry. He retired on 17 July 1969.