Partograph is the graphic representation of labor and it is used to prevent prolonged labor with its complications. This study is aimed to assess the magnitude and determinants of partograph utilization in hospitals of Western Oromia, Ethiopia, 2017. Institution based cross-sectional study was conducted from January 2017 to April 2017 among obstetric care givers working in hospitals. Data was collected through face-to-face interview by using structured-questionnaire and analyzed by SPSS V. 20.0. Logistic regression analyses were used to see the association of different variables. 89.1% of study participants were using partograph during the study period. 83.7% and 92.1% had satisfactory knowledge and favorable attitude on partograph utilization respectively. Factors associated with underutilization of partograph were lack of special training on partograph (AOR = 0.08, 95% CI 0.02, 0.37), lack of local policy on partograph utilization (AOR = 0.08, 95% CI 0.02, 0.36) and having more than 10 deliveries in a day (AOR = 0.11, 95% CI 0.02, 0.65). On the other hand, being female obstetrics care provider (AOR = 4.74, 95% CI 1.22, 20.03) and having ? 4 midwives on duty (AOR = 3.20, 95% CI 1.05, 13.51) were positively associated with partograph utilization. This study revealed that knowledge, practice and attitude towards utilization of partograph were below WHO recommendation because of some modifiable factors. Keywords: Partograph, Western Oromia, Obstetric care providers.