Marriage is an important institution among women folks and marriage bring joy, peace, stability, focus and sense of belonging in womanhood. When delay occur it brings psychological trauma to women. Delayed marriage among women generally refers to women marrying at a later age than what is traditionally expected in each society and this varies by culture. Across many parts of the world, the average age of first marriage has been rising. This shift is linked to social, economic, and cultural changes rather than a single cause. Delayed marriage among women of reproductive age is influenced by several factors including social, economic, cultural, psychological, spiritual and personal factors. This study aimed to Assess the Determinants of Delayed Marriage Among Women of Reproductive Age in South-South Nigeria. This was a cross-sectional study involving 250 women. Participants’ age is between 18 to 47 years. A well-structured questionnaire was administered to participants. The study lasted for a period of 2 months. Statistical analysis was done using SPSS version 25.0 and p < 0.05 was significant. The results revealed that majority (36%) of the participants were between 29-34 years old, 76% had tertiary education, 40% are unemployed, 60% residence in Urban areas, 60% are not in a relationship. Several factors were responsible for the delay in marriage including: financial instability 80%, 80% is delayed due to economic responsibilities, 80% is due to career development, 76% due to cultural influence, 68% is due to psychological influence, 80% influenced by family expectations, 80% due to social pressure, 76% due to personal factor, 68% due to desire for independence, and 68% is due to previous relationship experiences. This delay in marriage is due to social, economic, financial, personal, psychological, cultural, career development, and desire for independence.