A universal connector (5) is provided for connecting an architectural covering to an architectural surface. The connector has an adaptor plate (6) that is substantially circular and has one or more radially outwardly projecting flanges (16) and is arranged to be inserted into a ring-shaped engagement member (7) having one or more openings (18) in a front cover (17). The adaptor plate and the engagement member are configured such that the adaptor plate may be inserted into the engagement member by aligning the one or more flanges of the adaptor plate with a respective opening in the front cover of the engagement member and removal of the adaptor plate from the engagement member may subsequently be prevented by a partial rotation of the adaptor plate relative to the engagement member.