Background and aimsAbortion influences the composition and size of population. Estimating the overall and type-specific abortion rates, the reasons to choose the abortion can be helpful in designing and implementing preventive intervention. Therefore, the present study was designed to determine the: (i) prevalence of abortion, (ii) attitude of married women of reproductive age towards abortion, and (iii) reasons for choosing abortion by married women of reproductive age in Qazvin province.MethodsA cross-sectional study was conducted between February and April 2023, and comprised married women of reproductive age (N = 1571) referred to urban and rural comprehensive health centers in five cities of Qazvin province. Utilizing multi-stage proportional sampling process, data for the survey (including demographic and fertility information, reasons for choosing abortion, and attitudes toward abortion) were collected online.ResultsThe lifetime prevalence of abortion was 18.6% (among the total sample). The past-year prevalence was 22.3% (among those who reported having had an abortion). Of those reporting having had an abortion, 73.6% reported it was their first one, and 65.1% reported it was non-spontaneous . Women’s reasons for choosing abortion fell into one of three main clusters: (i) couple’s behavior, health and relationship problems, (ii) fertility-related stressful experiences, and (iii) family economic situations. The main reported reason to choose abortion was a couple’s behavior (e.g., drug use), health (e.g., physical disease, psychological problems), and relationship problems (e.g., sexual infidelity, divorce) explaining 27% of the variance. Also, pro-abortion attitude was the most important attitude towards non-spontaneous abortion explaining 26.33% of variance. The variables that increased the likelihood of non-spontaneous abortion included choosing a reason for abortion vs. having no reason (OR = 1.77, p = 0.05), having poor vs. good mental health (OR = 1.74, p = 0.03), having a pro-abortion attitude (OR = 1.09, p = 0.09), and having ≥ 3 children vs. having no children (OR = 0.53, p = 0.06).ConclusionWomen in high-risk groups for non-spontaneous abortion (i.e., those aged over 35 years, those married for more than five years, those with an infertility history, those with a lower number of children, those living in rural areas, and those having poor mental health status) should be assessed by primary healthcare services during preconception and have early prenatal counseling to help in decisions regarding abortion.