A flagpole top support bracket assembly for a top end of a flagpole is disclosed, and includes a cap for mounting on the upper end of the flagpole. The cap defines a cavity for receiving an upper portion of the flagpole, and the cavity extends inwardly from an opening in a lower end of the cap. The cap has an outer surface and an annular groove formed in the outer surface. The bracket assembly further includes a support mounted on the cap, and the support is rotatable with respect to the cap. The support includes a mounting lip for resisting sliding of the support off of the cap, and the mounting lip extends inwardly toward the cap and is configured to be at least partially positioned in the annular groove of the cap.