A novel bag holder is provided. In an embodiment, the bag holder includes a retaining bar that is shaped like a rectangular box. The bag holder also includes a wall bracket having a channel portion complementary to the shape of said retaining bar. The wall bracket can be mounted to vertical surface such as a wall. A portion of the rim of a plastic bag can be rolled around the retaining bar. Then, the retaining bar with the bag can be inserted into channel portion thereby securing the bag and facilitating the depositing and withdrawal of articles from the bag opening.