A disposable support for containers for treating biological samples in cytocentrifuges, that comprise a vertical flat supporting base with a protruding wall that supports at least one funnel connected in a lower region to a corresponding horizontal connection channel, the support being composed of a single element made of molded plastic material, and comprising a flat supporting body with protruding edges for accommodating, in succession, a slide, a filtering card and the container base, clamps for retaining the slide, the filtering card and the base container, and a transverse pivot for fixing the support to a cytocentrifuge.