Catherine Cummins or Mother Mary Polycarp (6 February 1879 – 11 November 1967) was an Irish Sister of Charity nun and founder member of Cappagh Orthopaedic Hospital.
The order had been bequeathed Cappagh House in 1908, which they planned to adapt into an open-air orthopaedic hospital in 1920.
Cummins was asked to take over the preparations for the hospital while still superior of Temple Street.
The children who had been in residence there were sent home at Christmas 1920 at the end of their term of convalescence, allowing work to begin on the hospital.
For the 1932 Eucharistic Congress, a high platform with steps, with loudspeakers and glass walls was erected on O'Connell Bridge.
She then transferred to Harold's Cross, working in Our Lady's Hospice to extend the accommodation provided.