The aim of this research was to examine relationship between attachment, self-esteem and subtypes of jealousy in romantic relationships and examine differences in jealousy regarding socio-demographic characteristic. The sample was comprised of 450 heterosexual adults. All participants were in some form of romantic relationship during participation in research. Instruments used in the research were Questionnaire about socio-demographic characteristics, Experiences in Close Relationship Inventory, Rosenberg's Self-Esteem Scale and Multidimensional jealousy scale. The results have shown that participant high on attachment anxiety dimension score higher on all subtypes of jealousy, while those high on attachment avoidance dimension show higher cognitive jealousy. Self-esteem has shown significant negative correlation with cognitive and behavioral jealousy. Significant predictors of cognitive jealousy were attachment dimensions and infidelity experience. Emotional jealousy was predicted by attachment anxiety and sex, while behavioral jealousy was predicted by attachment anxiety and length of relationship. Sex and age differences were only found in emotional jealousy with women scoring higher than men. Participants with infidelity experience showed higher results on all three subtypes of jealousy, whereas those with relationship length shorter than a year scored low on behavioral jealousy scale. There were no significant differences in subtypes of jealousy considering relationship status.