There is no recent national data on the prevalence of intimate partner violence in Thailand. This study proposed to examine the prevalence of intimate partner violence in 4 regions of Thailand by using a standardized questionnaire from the WHO multi country study on women's health and domestic violence. Two thousand four hundred and sixty-two married or cohabiting women aged 20-59 years were interviewed about their experiences of psychologically, physically, sexually violent, and/or controlling behaviors by their male partners. The study found that 15% of respondents had experienced psychological, physical, and/or sexual violence in their life time which suggests that 1 in 6 of Thai women have faced intimate partner violence. Of the 15% of women who reported intimate partner violence within the past 12 months, psychological violence was the most common (60-68%), followed by sexual violence (62-63%) and physical violence (52-65%). In addition, the percentage of women who faced various forms of controlling behaviors varied from 4.6% to 29.3%. Men who were more controlling were more likely to abuse their female partners. The results reveal that partner violence against women is a significant public health issue in Thai society that must be addressed.