Abstract: Using the data derived from the 1989 Bangladesh Fertility Survey (BFS), the 1993-94 and 1996-97 Bangladesh Demographic and Health Surveys (BDHS), this paper attempts to investigate the relationship between the age at marriage and fertility. It also examines the factors affecting age at marriage at different time periods. Analysis using number of children ever born as a measures of fertility shows that lower the age at marriage, higher is the fertility. Application of multiple classification analysis technique indicates that age at marriage increases with higher socioeconomic conditions in Bangladesh. Female education appears to be the strongest determinant of variation in age at marriage and all other factors such as place of residence, work status, religion and geographic region show a statistically significant relationships.