Presented study introduce the correlation of creativity, personality and cognitive complexity. The structure of cognitive processess has been great topic since the turn of 20th century. The research on cognitive styles have brought many new findings on the interconectedness of personality and cognitive processes such as perception, thinking and decision making, memory etc. Theories of cognitive complexity represent one contribution of this period, which aims on how are the cognitive processess structured, how this structure affects the effectivity of decision making and how it’s affected by different internal or external factors such as sex, age, \npersonality, social context, time pressure etc . In the first part of our research we conducted an analysis of \ncorrelation between divergent thinking factors and cognitive complexity measures following the approach of P. \nSuefeld and P.E. Tetlock. Figural and verbal fluence, flexibility, elaboration and originality were measured by \nsubtests Torrance test of creative behaviour and Guilford Alternative uses test. Cognitive complexity was scored \non the Paragraph completion test data following the Integrative/Conceptual complexity scoring manual (Baker-Brown et al., 1992). In the second part of study we conducted correlation study of cognitive complexity and Big Five personality traits (measured by Czech version of NEO-FFI by Hřebíčková & Urbánek, 2001). The article gives a summary of main findings of our studies and briefly sketch out the questions and hypotheses for future research on the complexity of thought.