Composition comprising an aminosilicone, a cationic surfactant, an associative polymer and a thickening agent The present invention relates to a composition for treating keratin fibres, in particular human keratin fibres such as the hair, comprising (i) one or more amino silicones, (ii) one or more cationic surfactants different from (i), (iii) one or more associative polymers and (iv) one or more thickening agents different from (iii). The invention also concerns a process for treating keratin fibres, in particular human keratin fibres such as the hair, and a use for hair care employing the said composition.