Purpose: The purpose of this study was to develop an integrated model of self-actualization based on humanistic theories to resolve problems in previous classifications. Methods: The research method is qualitative with the statistical population of humanistic psychology texts including "Motivation and Personality" (Maslow, 1970), "The Farther Reaches of Human Nature" (Maslow, 1971), "Religions, Values and Peak Experiences" (Maslow, 1970b), "Self-Actualization and Beyond" (Maslow, 1965); "On Becoming a Person" (Rogers, 1961); "Man’ s Search for Meaning" (Frankl, 1984), "The Will to Meaning" (Frankl, 1988); "Pattern and Growth in Personality" (Allport, 1961) and "Becoming" (Allport, 1955). Thematic analysis was applied to analyse data. After reviewing the texts and coding of the concepts, the themes were identified, classified and named. Results: Analysis of the Humanistic Psychologists texts was conducted to four main themes including eighteen subthemes. The findings show that self-actualization has four " transcendental self", "aware self", "creative self" and "social self" factors. Conclusion: According to the model achieved in this Study, developing a scale to measure self-actualization based on this integrated model, would reduce the effect of definition differences on self-actualization scores in various cultures.