Tanzania Demographic and Health Survey show 96% of women know at least one contraceptive method, but only 26% of married women are currently using any method. The study determines factors that influence contraceptive use for married women in Tanzania, analysing secondary data from TDHS through descriptive study design. Results show that fearing of side effects, desire to have more children, problem with access and availability, husband disapprove of contraceptive use, women education, regions, husband and women approves of family planning, discussion of family planning with partner, wealth index, and religion are determinants factors for contraceptive use. From results, I recommend increasing women enrolment in primary, secondary as well as university educations. Moreover, Ministry of Health and Social Welfare and other stakeholder should conduct adequate and reliable counseling, timely follow-up of user and empower service providers to remove misconception about side effects as well as male involvement as an actor.