An object of the present invention is to provide a pigment composition capable of exhibiting good dispersibility and dispersion stability of a pigment in a polyurethane ink or the like, and a colorant and a liquid ink containing the pigment composition. Specifically, the pigment composition of the present invention contains at least one organic pigment selected from the group consisting of benzimidazolone azo pigments and quinacridone pigments, and at least one polycarboxylic acid compound represented by the following Formulae (I) to (II).

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(The descriptions in Formula (I), Formula (II), and Formula (II) are as described herein.)