The objective of this study was to study the health belief model, health locus of control and health behaviors related to carcinoma of cervix prevention in postpartum women at Rajavithi Hospital. The sample consisted of 310 postpartum women who rehabilitated at Obstetrics Postpartum Department, Rajavithi Hospital. Data were collected by structured interview and set of questionnaire. Statistical techniques were implemented in the process of data analysis including t-test, One-Way analysis of variance, Pearsons Product Moment Correlation Coefficient and the stepwise multiple regression. The results were as follows: 1. Most postpartum women have perception about health belief model on carcinoma of cervix, especially perceived susceptibility in fair level, perceived severity in high level, Perceived benefits in high level and perceived barrier in poor level. 2. They have perception about health locus of control, such as, internal health locus of control in high level, powerful others health locus of control in high level and chance health locus of control in moderate level. 3. The practice behaviors related to carcinoma of cervix prevention in postpartum women are in a fair level. 4. Practice behaviors, related to carcinoma of cervix prevention among postpartum women having different age, education level, family income and occupation are statistically significant different at the .001 level. The postpartum women having different age of first intercourse, age of first pregnancy and carcinoma of cervix information are statistically significant different at the .05 level. 5. There were no difference of practice behaviors related to carcinoma of cervix prevention among postpartum women of different number of deliveries and experiences of family member or friends having carcinoma of cervix. 6. There were statistically significant positive correlations between perceived susceptibility, perceived severity, perceived benefits, age, education level, family income, age of first intercourse, age of first pregnancy, internal locus of control and practice behaviors related to carcinoma of cervix prevention at the .001 level. There were positive correlations between carcinoma of cervix information number of deliveries and practice behaviors related to carcinoma of cervix prevention at the .01 and .05 level of significance. 7. There were statistically significant negative correlations between perceived barrier, chance health locus of control and practice behaviors related to carcinoma of cervix prevention at the .001 level. 8. Experiences of family member or friends having carcinoma of cervix and powerful others health locus of control have no significant correlations with practice behaviors related to carcinoma of cervix prevention. 9. The results of the stepwise multiple regression analysis show that 22.36 percent of the variance of postpartum women practice behaviors related to carcinoma of cervix prevention was accounted for three significant predictors, i.e., perceived susceptibility, perceived severity and chance health locus of control.