Background: Despite the availability of highly efficient contraception, approximately one third of all pregnancies in the world are still unintended. These pregnancies may be associated with a high risk of morbidity and mortality; particularly in areas where safe abortion is inaccessible or where quality obstetric services are unavailable for those women continuing a pregnancy to term. Every year, 210 million women around the world become pregnant. Of these, 80 million pregnancies are unplanned. Out of these, 46 million pregnancies are terminated each year, and 19 million are ended with unsafe abortion. More than 97% of unsafe abortions occur in developing nations. Most of these results are from nonuse of contraception or from noticeable contraceptive failure, all of which may be avoided by the use of emergency contraception methods. Aim of the study: The present study aimed to determine the effect of jigsaw cooperative learning strategy (independent variable on obstetric nurses' knowledge and information retention (dependent variable) of emergency contraceptive methods. Methods A quasi experimental research design was used in this study. This study was carried out at