Sisters of Mercy is an organization of women belonging to the Roman Catholic Church. These women vow to serve the community, especially those who are impoverished and sick, with a special emphasis on women and children. The Sisters of Mercy in Oak Park belong to the West-Midwest Community, which is made up of over 800 sisters. The Sisters of Mercy in Oak Park have recently organized events such as The Busy Person's Retreat. This is one of two locations in Oak Park where the sisters live and gather.