Family planning services are important for the health of mothers and babies, Family planning services are important for the health of mothers and babies, preventing both unwanted pregnancies and superfecundity. Sanliurfa has the highest fertility rate in Turkey, and the rate of giving birth at very young and old ages and mother-baby deaths are also high there. Therefore, it is important to encourage access to and use of family planning services among men in Sanliurfa, which has a patriarchal societal structure. This study aimed to determine the knowledge, opinions, and behaviors regarding FP methods among married men living in Sanliurfa, Turkey. The sample of this cross-sectional study included 300 married men aged over 18. The study found that married men living in Sanliurfa had a high level of knowledge about family planning methods; however, their use of family planning methods was low. They also held the opinion that men should actively take part in the use of family planning methods. Language and social insurance were found to be the most important factors affecting men’s use of family planning methods.