Salomon Maimon argued forcefully for the indispensability of what he called “the method of fictions” in mathematics and physics, but also in philosophy. This last claim provoked critical responses from G. E. Brastberger, G. E. Schultze, and K. L. Reinhold. This paper offers a brief exposition of Maimon's “method of fictions” and an analysis of his response to critics of his claims concerning the employment of this method within philosophy.