Abstract: The invention is an anti-vortex assembly for mounting at the entrance to the outlet port of a propellant tank. In detail, the anti-vortex assembly includes a hollow cylindrical frame assembly having a longitudinal axis, open top and bottom ends, and top and bottom circular shaped support members connected together by equally spaced vertical support members. A baffle assembly is mounted within the frame assembly and which includes a plurality of perforated baffle plates having first and second ends. The first ends of the baffle plates are joined together at the longitudinal axis of the frame assembly and the second ends are joined to the vertical support members of the frame assembly. A first cylindrical shaped filter assembly is mounted about the frame assembly and a second flat disc shaped filter assembly is mounted over the top opening thereof. Fasteners are used to secure the frame member and the first filter assembly to the tank about the periphery of the outlet port.