To provide a dye capable of forming an anisotropic dye film showing high dichroism and having a high degree of molecular orientation, a composition containing the dye, an anisotropic dye film using the dye and a polarizing element. A trisazo dye, of which the free acid form is represented by the following formula (1), wherein at least one of B.sup.1 and D.sup.1 has at least one substituent as defined by the following Q1, a dye composition for an anisotropic dye film containing the dye, an anisotropic dye film and a polarizing element using the anisotropic dye film: Q1: an alkyl group or alkoxy group substituted by a hydrogen bond-forming group: ##STR00001## wherein A.sup.1 is a phenyl group or a naphthyl group, each of B.sup.1 and D.sup.1 is a phenylene group or a naphthylene group, X.sup.1 is an amino group which may be substituted or a hydroxyl group, and m is 0 or 1.