To minimize the gonadotoxic effect of chemotherapy by the cotreatment with a GnRH agonistic analogue (GnRH-a). Prospective nonrandomized study with concurrent and historical controls. University medical center. One hundred fifteen female patients with Hodgkin lymphoma (HL). Sixty-five patients received a monthly injection of GnRH-a, administered before starting chemotherapy until its conclusion, up to a maximum of 6 months. Thirty-five patients were treated with ABVD and 76 with a procarbazine-containing regimen. This group was compared with a control group of 46 women who were treated concurrently with similar chemotherapy (n = 26) without GnRH-a or were historical controls (n = 20). Cyclic ovarian function (COF) versus premature ovarian failure (POF). The ovarian function could be determined in 111 patients. In the GnRH-a/chemotherapy group, 63 out of 65 patients resumed ovulation and regular menses (96.9 %), compared with 63% of the 46 control subjects. Twenty of the 22 patients in the BEACOPP/escalated BEACOPP/GnRH-a cotreatment resumed cyclic ovarian function versus 9 of the 14 in the chemotherapy-only group. All 17 MOPP/ABV/GnRH-a cotreated patients resumed COF versus 11 of the 22 in the chemotherapy-only group. There was no significant effect of the GnRH-a cotreatment regarding COF in the ABVD group. There were no significant differences in the cumulative doses of the various alkylating agents between the two groups. Cotreatment with GnRH-a may reduce ovarian damage significantly in female patients treated for HL and should be considered in addition to assisted reproduction for women in reproductive age receiving gonadotoxic chemotherapy.