Aims Folic acid is required for the growth and development of the fetus. There is strong evidence that taking folic acid before pregnancy and during the first trimester reduces the risk of neural tube defects (NTDs). This study aimed to assess women's awareness of preconception folic acid supplementation and its importance to the mother and the fetus. Methods This was a cross‐sectional questionnaire study conducted in Saudi Arabia between January and April 2019. An electronic questionnaire tool was designed and distributed using Google Forms through social media (Facebook and WhatsApp) websites. Binary logistics regression was used to estimate odds ratios (ORs), with 95% confidence intervals (CIs) for predictors of poor levels of awareness about folic acid. Results A total of 514 women participated in this study. The age range for the study participants was 18‐45 years. Only 24.1% of the participants reported that they routinely took folic acid. The most commonly reported source of information about folic acid use was the doctor. The majority of the participants had poor awareness of folic acid use. Older age (30 years and above) and not taking regular folic acid supplements were important predictors of poor awareness of folic acid. Having a university degree or higher education was an important predictor of increased awareness about folic acid. Conclusion Our study found that the awareness of the Saudi women was poor in identifying the generic name of folic acid, recognising the sources of folic acid, the correct dose of folic acid, and the side effects of high doses of folic acid and that there was good knowledge about the importance of folic acid, the consequences of folic acid deficiency, and the belief that even non‐pregnant women and girls of childbearing age should take folic acid.