Mary Dillon (born 1964) is an Irish folk singer from Northern Ireland, known for her work with the traditional band Déanta.

She was raised in a musical household and one of her five siblings is fellow folk singer Cara Dillon.

[2] She has never pursued singing as a full-time career and currently works as an English teacher at St Cecilia's College in Derry.

[5] In 2010, she released a digital-only EP containing covers of Army Dreamers by Kate Bush, Undone in Sorrow by Ola Belle Reed and Streets of Philadelphia by Bruce Springsteen.

[6] In 2012, she joined fellow Irish folk singers Niamh Parsons and Tíona McSherry to form an a cappella group called Sí Van.