Background: Tetanus is a vaccine preventable disease. Tanzania through its Ministry of Health, Community Development, Gender, Elderly and Children (MoHCDGEC) recommend all women should receive at least five TT doses in their reproductive life. Little is known on predictors of TT uptake during pregnancy among women of reproductive age in TanzaniaMethod: The study used data from the 2015-16 Tanzania Demographic and Health Survey and Malaria Indicators Survey (2015-16 TDHS-MIS). A total of 6924women of active reproductive age from 15 to 49 were included in the analysis. Both univariate and multiple regression analyses were used to determine the predictors of TT uptake during pregnancy among women of reproductive age in Tanzania.Results: More than half, 3480 (50.3%) of the study population had either no or one tetanus injection. A total of 3444 (49.7%) had two or more tetanus injection during pregnancy. After adjusted for confounders, predictors of uptake of tetanus vaccination were early antenatal booking (AOR=1.174 at 95% CI=1.033-1.335, p=0.014), age group of women [ 20 to 34 years (AOR=1.433 at 95% CI= 1.155-1.778, p=0.001), more than 34 years (AOR=1.379 at 95% CI=1.065-1.786, p=0.015)], wealth index [ rich (AOR=1.261 at 95% CI= 1.083-1.468, p = 0.003)], parity [para 2-4 (AOR=0.401 at 95% CI=0.343-0.468, p<0.001), para 5 and above (AOR=0.217 at 95% CI=0.178-0.265, p<0.001)], level of education [ primary level, (AOR=0.864 at 95% CI=0.754-0.99, p=0.035)] zones [Unguja Zanzibar Island (AOR=0.434 at 95% CI=0.309-0.609, p<0.001), Pemba (Pemba Island) (AOR=0.34 at 95% CI=0.226-0.512, p<0.001)] and adequate ANC visits (AOR=0.649 at 95% CI=0.582-0.723, p<0.001)Conclusion: Antenatal care service utilization, including both timeliness and the number of ANC visits attended were found important predictors for TT vaccine uptake. Therefore, the responsible ministry of health in the country should strengthen the strategies in place to increase maternal awareness on importance of ANC service utilization.