Popper oeuvre is mostly unknown among psychologists, besides a piecemeal of information about his contributions to Philosophy of Science. Nevertheless, Popper has always been in close and productive contact with Psychology, since his first academic studies in the area, to his later works on Mind Philosophy. The minor goal of this work is to retake from the History books the study of these relations, although it intends to go further defending their value to the contemporary Psychology, in different levels: from the metalevel, to the formulation of empirically testable hypothesis. The main results of my research are: a) identify Bühler and Selz as the main psychological influences over Popper's work. Selz's Learning Psychology had served as an inspiration to Popper thoughts about the nature of the processes involved on the growth of knowledge, as Bühler's pluralistic solution to the "Crisis in Psychology" problem, and his also pluralistic Language theory, had helped in the creation of his methodological pluralism; b) pointing Popperian methodological pluralism as the ground to an interactionist epistemology. His pluralism has great potential repercussions to Psychology mainly the form of his Worlds Theory, and the role given to the third world in the constitution of the psyche and mediation of the communication of sentient beings; c) Popper's flirts with evolutionary theory, as the genetic dualism model, and the proposition that his knowledge growth scheme could be understood as a general formula of the Darwinian evolution, contribute to the current discussion in Evolutionary Psychology about the role of the active behavior of the organism upon the evolutionary pathways, and the reach of the universal darwinism; d) the idea that the "I" can be understood as a world 3 object, results in a fertile field of speculation on contemporary Cultural Psychology problematic, as the concept of interobjectivity and the complementary nature of internalization and externalization processes; e) some concrete proposal of empirical testable hypothesis are presented trying to connect the Popperian idea that the scientific activity is at the same time a creative an critic activity with the Dialogical-Self perspective. I-Critic and I-Creator could be taken as concrete scientists I-positions; f) Popper's maturity philosophy, with its emphasis on the criticism of inductivism and in the prescription of a certain scientific ethos, can help us to face the old problem of the "Crisis of Psychology". Although the results present don't exhaust all the possibility of dialogue between Popper's work and psychological inquiry (once there still being other aspects that could be explored, as the relationship among Popper end Psychoanalysis; the problem of the methodological individualism and its consequences to the Social Psychology; new ways to look at the unconscious from the Popperian assumption of the world 3 nature of the Self), we believe the present work represents substantian improvements to the theoretical debate about the relationships it ...