Although there are numerous studies on impact evalu ation of overall health insurance, little is known on the impact of health insurance o n health care utilization and out-of- pocket health care spending of children, especially in developing countries. This paper measures the impact of child health insurance on he alth care utilization and spending of children from 6 to 14 years old in Vietnam using tw o recent nationally representative surveys. Unlike previous empirical studies which fo und a positive effect of health insurance on health care utilization in Vietnam, we did not find a statistically significant effect of school health insurance as well as free h ealth insurance for children on outpatient health care contacts. However, the school health in surance and free health insurance help the insured children decrease out-of-pocket spendin g per outpatient contact by around 14 and 26 percent, respectively.