Background. Many studies have shown significant reduction of fertility in endometriosis. Mechanisms of infertility are still not completely clear. The aim of our study is to obtain the effectiveness of laparoscopic treatment of infertility for different stages of endometriosis. Methods. The effectiveness of laparoscopic treatment of infertility in endometriosis was observed through a questionnaire that was sent to 281 patients (pts), who had laparoscopic treatment at the Department of Obstetrics and Gynecology Ljubljana during the period from 1999 to 2006 due to endometriosis as the only cause of infertility. 53.4 % (150/281) pts, who answered the questionnaire, were divided into group I (minimal and mild endometriosis) and group II (moderate and severe endometriosis). We established the rate of pregnancy (in total, spontaneous and ART) and compared the results between two groups. Relatively small percentage of answered questionnaires was most likely due to the fact that the questionnaires were sent to pts who were operated several years ago and did not respond or have changed their address. Because the study is still ongoing, we present partial results. Results. For 132 pts wanting to get pregnant the overall pregnancy rate was 76.5 % (101/132). The rate of pregnant pts depended on the stage of endometriosis. In group I 86.8 % (79/91) pts became pregnant – 58. 2 % (46/79) spontaneously, 41.8 % (33/79) with ART. In group II 53.6 % (22/41) pts became pregnant – 68.2 % (15/22) spontaneously, 31.8 % (7/22) with ART. The difference between groups was statistically significant (p < 0.05). Conclusions. Our results are comparable to the results found in the literature. Laparoscopic treatment of infertility is effective in all four stages of endometriosis. According to our results laparoscopic treatment has the primary role in the treatment of endometriosis-associated infertility