Introduction: Abortion is one of the five leading causes of maternal death in developing world globally. Objective: To assess the knowledge, Attitude and Practice on abortion among women in  slums of Guwahati City. Methodology: Community based cross sectional study on  women in reproductive age groups( 15–49 years) in  slums of Guwahati city, from  April to July,2017.  A sample size of 230 participants were interviewed for the study,by taking 50% proportion of women in 15–49 years to be selected  from the slums. Results: Maximum were in the age group of 26–35 years. Knowledge on abortion  is 83.47%% among the participants,although  poor (31.2%) knowledge on legalisation  of abortion.While 57%  think that abortion is a good practice,37.3% of them would abort the conceptus if unwanted pregnancy occurs. Conclusion: Emphasis should be given on improving the knowledge on legal  abortion by IEC among the women.