Pregnancy outcome after complete and partial hydatidiform mole was evaluated in 170 patients. Of the 170 patients, 143 became pregnant a total of 250 times. Patients with incomplete hydatidiform mole had 232 subsequent pregnancies that resulted in 169 (72.8%) term deliveries, 30 (12.9%) spontaneous abortions, 7 (3.0%) induced abortions, 6 (2.6%) stillbirths, 13 (5.6%) preterm deliveries, 6 (2.6%) recurrent moles and one (0.4%) ectopic pregnancy. Of the subsequent pregnancies in patients with partial hydatidiform mole, full-term delivery, spontaneous abortion and recurrent mole occurred in 10 (55.6%), 5 (27.8%) and 3 (16.7%) of the patients, respectively. Among the 9 patients with recurrent hydatidiform mole, viable term pregnancy was achieved in 4. Even patients with recurrent hydatidiform mole can be assured that they can have a normal subsequent pregnancy.