The article discusses factors affecting the age at marriage in Nepal. The article basically aims to identify the sub-groups which practice early marriage and the sub-groups which practice late marriage. The author attempts to relate their marriage patterns with the cultural practices that prevail in their societies based on anthropological research. This study is based on the data from a fertility survey of 1976. The article's analysis indicates that the social customs, traditions, and religious values attached to marriage affect ages at which marriage occurs. It clearly shows that age at marriage is higher among women who live in joint family system or whose marriage are arranged by parents. Marriage tends to get delayed due to economic reasons as well as the needs of the daughter's labor. Marriage also often gets delayed among the groups which encourage new couples to set up an individual household. (Rajeev Ranjan Singh 2007-01-31)