We sought to examine motivators and barriers related to monovalent 2009 influenza A (H1N1) vaccination among pregnant women. We conducted a national poll of pregnant women using a random online sample (237) and opt-in supplement (277). In all, 42% of pregnant women reported getting the vaccine. Vaccination was positively associated with attitudinal factors including believing the vaccine is very safe or benefits the baby, and with provider recommendations. Women in racial/ethnic minority groups, women with less education, and women <35 years were less likely to get the vaccine and had differing views and experiences. Despite H1N1 vaccination rates that are higher than past seasonal influenza rates, barriers like safety concerns may persist in a pandemic. Messaging from providers that encourages women to believe the vaccine is very safe and benefits their baby may be compelling. Messaging and outreach during future pandemics may require customization to increase vaccination among high-risk groups.