Background: Unintended pregnancies may be mistimed or unwanted. It represents 40% of all pregnancies, and it had multiple risky health outcomes. It is essential to understand the factors affecting unintended pregnancies and their consequences to develop strategies that help prevent them. The present study is conducted to identify the prevalence, determinants, and outcomes of unintended pregnancies in Sohag district, Egypt. Methods: A cross-sectional study was conducted in Sohag district, 2016. Five hundred fifty-four ever married women aged 18-49 years whose last pregnancy was in the 3 years preceding the data collection date were randomly selected from rural and urban localities. Data were collected through home visits using a validated questionnaire. In this study, Sohag city represents the urban place, while Tunis and El-Sheikh Makram villages represent the rural places. Results: Nearly one third (30.7%) of the study sample had an unintended pregnancy within the last 3 years from the time of interview. Regression analysis showed that young women < 30 (OR = 2.24, 95% CI 1.12-4.48, p = 0.02), young husbands ≤ 30 (OR = 5.44, 95% CI 1.14-26.11, p = 0.03), women working for cash (OR = 6.16, 95% CI 3.15-13. 92, p < 0.0001), monthly income ≤ 1200 LE (OR = 34, 95% CI 6.41-187.52, p < 0.0001), and spacing < 24 months (OR = 8.79, 95% CI 4.33-17.80, p < 0.0001) were risk factors for mistimed pregnancy. On the other hand, women working for cash (OR = 11.43, 95% CI 3.22-40.62, p < 0.0001), living children ≥ 5 (OR = 11.45, 95% CI 2. 84-46.07, p = 0.001), and the woman's perception of her family size as higher than the ideal (OR = 394.8, 95% CI 97.36-1601.17, p < 0.0001) were risk factors for unwanted pregnancy. Mistimed and unwanted pregnancies were significantly associated with late start of antenatal care (ANC), low birth weight (LBW), and no breastfeeding. In addition, unwanted pregnancies were associated with more pregnancy complications. Conclusions and recommendations: Unintended pregnancy represents a public health problem in Sohag. Therefore, improving services in rural areas and improving the economic level and effective use of family planning methods could reduce the risks associated with the unintended pregnancy.