One of the most influential factors in exclusive breastfeeding is the husband's support. Giving booklet becomes one way to increase husband's knowledge, attitude, and support toward breastfeeding. The aims of this study were to identify the effect of giving booklet on husband's knowledge, attitude, and support to exclusive breastfeeding; and to search for the correlation between husbands' characteristic, knowledge, attitude, and their support. The research design was quasi-experiment with pre-test and post-test with control group that had been held in May-June 2018. Samples of this study were all husbands of trimester III pregnant women that had been selected with inclusion and exclusion criteria. The samples were 36 husbands. Data analysis used Independent t-test, and MANOVA. Measuring instrument was questionnaire. There was a difference in knowledge increased between two groups with p value=0.026. There was a difference in attitude increased between two groups with p value=0.015. There was a difference in support increased between two groups with p=0.018. There was effect of giving booklet on increasing husband's knowledge, attitude, and support to exclusive breastfeeding. There was no correlation between husband's education, income, number of children, and age with husband's knowledge, attitude, and support toward breastfeeding on pregnant woman.