Abstract: In this paper is analyzed Ernst Cassirer’s transcendental philosophy and his theoretical foundation of “cultural sciences” (Geisteswissenschaften). His perspective is a transcendental “logic of the cultural sciences” based on the idea that the man is not only a “rational animal,” but also an animal symbolicum. Continuing the methodological approach of Hermann Cohen, Cassirer expands the Kantian vision of the transcendental epistemology to the cultural phenomena, and argues that objective and universal validity can be achieved not only in the natural sciences, but also in practical, cultural, moral, and aesthetic phenomena. He asserts that a type of inter-subjective “objective validity” takes place in the cultural sciences: it is the universal form of symbolic activity. In the paper, particular attention is given to the sources of the Cassirer’s major work: the three volumes of Philosophy of Symbolic Forms, dedicated to the Language (1923), to the Myth (1925), and to the Phenomenology of knowledge (1929). Thus, it has been underlined the fundamental role that it has had for Cassirer the study of the romantic linguistic: particularly, Herder and Wilhelm von Humboldt. Reflecting on these romantic authors Cassirer elaborates a vision of the transcendental as linguistic and historical “form of mind”. In the last part of the paper, are highlighted the ethical aspects of Cassirer’s thought. He affirms that the transcendental production of the symbolic forms is founded on the human freedom, and it is finalized to an increasing emancipation of man.