Over the years women have been regarded as the sole users of family planning services and little is known nearly what deters men from participating in family planning. This study aimed to determine the factors associated with men's involvement in family planning among married men living in rural setting of Baraton Sub-location, Nandi County, Kenya. A cross-sectional study design was used and data was collected from a sample size of 250 married men. The study revealed that although men are regarded as heads of household about half(54.8%) of respondents had not used family planning. Religion, residing in urban area before, spousal communication, family clinic attendance by men and economic status were some of the significant factors that determined men's participation in the study area. This study provides new insight and information on family planning from men's own perspective living in rural areas in which researchers and healthcare professionals may benefit from.