Exclusive breastfeeding intention is a mother’s intention to provide her baby only breast milk since the infant was born until at the age of 6 months. Intention in prenatal period is the direct affirmation of exclusive breastfeeding. This study aimed to find out the most dominant factor related to exclusive breastfeeding intention among pregnant women at a mother and child hospital in South Tangerang. A cross-sectional study design was conducted primarily. The samples were 143 pregnant women on their third semester pregnancy selected by purposive sampling. Intention was measured by the Infant Feeding Intention scale questionnaire. Meanwhile, attitude, subjective norms, and perceived behavioral control were measured by the modified Breastfeeding Attrition Prediction Tool questionnaire. Data were analyzed using the multivariate logistic regression analysis. It was 61.5% mother had strong exclusive breastfeeding intention. Perceived behavioral control dominantly influenced the exclusive breastfeeding intention (p value = 0.007; Odds Ratio 3.030; 95% CI = (1.361-6.746)). The other factors influencing intention were attitude, exposure to exclusive breastfeeding from social media, health workers’ support, previous breastfeeding experienceand mothers’ occupation. A mother with high perceived behavioral control has three times more likely to have ‘high exclusive breastfeeding intention’ than those having the low ones.AbstrakIntensi pemberian ASI eksklusif adalah intensi ibu untuk memberikan hanya ASI pada bayinya sejak dilahirkan hingga berusia enam bulan. Intensi pada periode prenatal merupakan penentu langsung pemberian ASI eksklusif. Penelitian ini bertujuan mengetahui faktor paling dominan berhubungan dengan intensi pemberian ASI eksklusif pada ibu hamil di sebuah rumah sakit ibu dan anak di Kota Tangerang Selatan. Penelitian dengan desain studi potong lintang dilakukan secara primer. Sampel berjumlah 143 ibu hamil trimester ketiga dipilih secara purposive sampling. Intensi pemberian ASI eksklusif diukur menggunakan kuesioner the Infant Feeding Intentions scale. Sedangkan sikap, norma subjektif dan persepsi kontrol perilaku dinilai menggunakan modifikasi kuesioner Breastfeeding Attrition Prediction Tool. Data dianalisis menggunakan analisis regresi logistik ganda. Sebanyak 61,5% ibu memiliki intensi kuat memberikan ASI eksklusif. Persepsi kontrol perilaku paling dominan berhubungan dengan intensi pemberian ASI eksklusif, (p=0,007; Odds Ratio 3,030; 95% CI (1,361-6,746). Faktor lainnya yang berhubungan dengan intensi adalah sikap, keterpaparan ibu terhadap ASI eksklusif dari media sosial, dukungan tenaga kesehatan, pengalaman menyusui sebelumnya, dan pekerjaan ibu dengan persepsi kontrol perilaku tinggi berpeluang tiga kali lebih besar memiliki ‘intensi tinggi’ untuk memberikan ASI eksklusif dibandingkan ibu berpersepsi kontrol perilaku rendah.