The article considers the theory of cognition of the Russian and Soviet philosopher Vasily Seseman (1884-1963) in its relation to the main philosophical orientations in early 20th-century: phenomenology, neokantianism, and intuitionism. Seseman’s theory of cognition is interesting today because, following the tradition of neo-Kantianism, it largely shares the principles and methods of phenomenology, poses epistemological problems that were not explicitly formulated by Edmund Husserl, and offers solutions that are relevant today. The article highlights a common thematic field combining phenomenology, neo-Kantianism, and intuitionism. This field is set by the initial subject-object cognitive attitude, the desire to identify the conditions for the possibility of cognition, the recognition of the presence of a non-linguistic level of knowledge. Moving in this unified theoretical cognitive context of the early twentieth century, Seseman offers his own solution to the following problems: defining the subject of cognition, developing the method of intuition in general and in relation to the contemplation of essence, distinguishing between objective and non-objective attitudes and using this distinction to describe different types of cognition, thematizing the irrational in cognition, and understanding the judgment and its role in the final formation of cognition. Seseman believes that the cognition of reality is preceded by the perception of its objects. He diverges from the Neo-Kantians, who claim that the objects of cognition are formed only in judgment, and holds a position than Husserl, according to whom we perceive the world around us already objectively. However, unlike Husserl, Seseman does not recognize the cognitive nature of perception and argues that knowledge begins with a reflexive fixation of the object of cognition. The cognition of an individual object is embodied in a judgment in which the relation of the object to its environment is fixed and the object is defined as a unique combination of universal properties. Finally, it is shown that the solution of epistemological questions inevitably leads Seseman to ontological issues.