BackgroundIn Tanzania, 27.1% of all women of reproductive age are currently using modern contraception, and 16.8% have an unmet need for family planning. We therefore examined factors associated with family planning uptake after giving birth in two regions of Tanzania.MethodsSub-analysis of a cross-sectional household survey conducted in April 2016 in Mara and Kagera regions in Tanzania. A total of 1184 women aged 15-49 years, who had given birth less than two years prior to the survey were included. Logistic regression mixed effect modelling was used to examine factors associated with family planning uptake. Univariate analysis was used to present crude effects of covariates, followed by stepwise forward selection to build a multiple logistic regression model. A p-value ≥ 0.20 was applied as the criterion to retain a variable into the model.ResultsAmong 1184 women within two years after giving birth, 393 (33.2%) used family planning methods. After adjusting for (1) age, (2) level of education, (3) living in union, (4) being accompanied to ANC by a partner and (5) being able to mention at least one method, factors independently associated with family planning uptake included: (1) having discussed family planning with the partner (aOR 2.90; 95% CI 1.88-4.49), (2) having been counselled on family planning during ANC (aOR 2.15; 95% CI 1.48-3.13), (3) having discussed family planning with a community health worker (aOR 3.32; 95% CI 1.91-5.77), (4) having discussed family planning with a facility health care worker (aOR 1.79; 95% CI 1.22-2.62), (5) having primary or higher educational level (aOR 1.66; 95% CI 1.01-2.273) and (6) being in union (aOR 1.86; 95% CI 1.02-3.42).ConclusionSupportive constitutes including educational interaction with facility and community health workers, as well as having a supportive partner are facilitators to increased uptake of family planning among women in Tanzania