Hygienic seal for a container (3), comprising an upper lid (1) and a lower ring (2) coupled to said upper lid (1) and being capable of being fitted around the body of the container (3), the upper lid having an extension (10) which projects outwards and is directed towards the lower ring (2) such that in a closed state of the container, the extension (10) of the upper lid (1) partially overlaps the lower ring (2). On an upper flange of the lower ring (2), positioning means (11, 20) are provided which comprise at least one depression (20) complementing a projection (11) which projects internally from the interior face of the extension (10). The interior face of the extension is directed towards the lower ring (2) and has tightening means (12; 120) which contact the lower ring (2) in a closed state of the container (3) when the projection (11) and the depression (20) are in contact with one another.