Padraigín Ní Mhurchú (20 February 1949 – 4 June 2019) was an Irish trade union leader.

Born in Rakeeragh, County Monaghan, Ní Mhurchú was educated at St Louis Girls' National School in Carrickmacross.

She also served on the Women's Advisory Committee of the Irish Congress of Trade Unions (ICTU).

With the union have a falling membership and financial difficulties, Ní Mhurchú refocused its activity on recruiting part-time workers, then in 1985 arranged for it to merge into the WUI.

In the early 1990s, she undertook a law degree at Trinity College Dublin, but suffered a brain haemorrhage and stroke in 1992, leading to her spending more than a year in hospital.