A computer-readable medium, computer-implemented method, and system are provided for filtering of custom attributes. A custom attribute is an attribute of an object defined by a user. Once a user has defined one or more custom attributes, the user can filter a set of objects based on a criteria that includes a value for one or more custom attributes. The filtering can be dynamic so that when the set of objects is modified (such as creating a new object, deleting an existing object, or modifying an existing object), the filter is automatically updated. Furthermore, a filtering criteria can be based on the set of objects present in the system, so that any filter that is defined returns at least one object. In addition, once a filter is applied, any additional filter applied to the original filter can have a filtering criteria based on the subset of objects returned by the original filter.