The Advisory Committee on Immunization Practices recommends that all health care personnel (HCP) be vaccinated annually against influenza (1). Vaccination of HCP can reduce influenza-related morbidity and mortality among both HCP and their patients (1–4). To estimate influenza vaccination coverage among HCP during the 2013–14 season, CDC analyzed results of an opt-in Internet panel survey of 1,882 HCP conducted during April 1–16, 2014.