Background: Periodontal disease as an oral manifestation during pregnancy, known as one of the risk factor for low birth weight and premature. Knowledge is known to be associated to pregnant women’s visit to the dentist which could maintain oral, baby, and pregnancy’s health. To determine the condition of knowledge and behavior of pregnant women related to oral health during pregnancy, a valid and reliable instrument is needed. Unfortunately, such instrument is lacking in Indonesia. Objective: To analyze the validity and reliability value of the Indonesian version of Knowledge and Behavior towards Oral Health during Pregnancy (KBOHP) questionnaire. Method: Analytic descriptive crossectional study, convinience sampling design. Cross-cultural adaptation is done using Symmetrical approach. Psychometric analysis were analyzed using content validity, construct validity, and test retest reliability. Result: KBOHP questionnaire was successfully cross-adapted culturally. There were 167 participants.  The value of content validity index (I-CVI) was 0.8 but the construct validity of the knowledge and behavior domain was ≥0.05. The test retest reliability showed the Intraclass Correlation Coefficient value of 0.89-1.  Conclusion: After successfully cross-culturally-adapted, KBHOP Indonesian version was valid and reliabel to be used in Indonesian population. However, improvement is still needed in order to improve the construct validity.