This study investigates the predisposing factors in adoption and utilization of Natural Family Planning (NFP) methods among women in Owerri Main Market. The main objectives was to determine the physiological basis of NFP methods, the advantages and disadvantages of NFP methods and to identify the predisposing factors in adoption and practice of NFP among women. Two hundred Fifty women were selected for the study through random sampling technique. A questionnaire was developed: Market Women Questionnaire on Natural Family Planning (MWQNFP) which was used to collect relevant data. The reliability of the instrument was by test re-test method and Data analysis was done using percentage (%) and Chi-square (X2). The result showed that all the respondents have heard of NFP before and NFP practice occurred only in 22 women (8.8%) while the remaining women practice other Family Planning methods. The main source of information and awareness was the hospital which was 109 women (43.6%) of the population and the least common source of information was obtained from news papers and magazine which was just 4 women (1.6%) of the population. knowledge of the physiological basis of NFP methods significantly influence its adoption and use (Chi-Square= 20.311, p-value < 0.001). Lack of time for daily monitoring and charting (20.7%), less partner co-operation and compliance (5.7%), irregular/unpredictable menstrual cycles (1.4%) and ignorance are the key factors found to militate against NFP practice among women. This statistically had a significant influence on the adoption and use of NFP methods (Chi-square=24.577, p-value <0.001). The study concluded that NFP practice among women would be improved by wider dissemination of information on NFP through public lectures and electronic medias; training of Family planning counselors to facilitate grassroots coverage; universal entrenchment of NFP counseling into routine antenatal clinic activities with emphasis on women education and empowerment; and encouraging men and community involvement in Family planning. Suggestions were also made for further research in related

Keywords: Predisposing, factors, adoption, utilization, NFP, women in market