Patrick Cassidy (born 1956) is an Irish orchestral, contemporary classical, choral, and film score composer.
Cassidy was born in Claremorris, County Mayo, Ireland. He received a Master's Degree in Applied Mathematics from Limerick University, and supported his early compositional activities with a day job as a statistician.
He is best known for his Narrative Cantatas—works he has written for Orchestra and Choir based on Irish Mythology. The Children of Lir released in September 1993 remained at number one in the Irish Classical Charts for a full year. It was the first Cantata ever written in the Irish language. The BBC later produced an hour long documentary on the piece.
Famine Remembrance, a commissioned piece to commemorate the 150th anniversary of the Irish Famine was premiered in New York's St. Patrick's Cathedral in 1996. A recording of the piece was released the following year. In June 2007, Famine Remembrance was performed at the opening of Toronto's Ireland Park with the President of Ireland as special guest.