In 2017, the World Health Organization (WHO) published a document aimed at facilitating influenza vaccine introduction and use in low- and middle-income countries. The document "The Immunological Basis for Immunization Series: Influenza Vaccines" is freely available on the WHO website. The main purpose of this document is to give immunization managers and vaccination professionals an authoritative but easily-understood overview of the scientific basis of influenza vaccination and the immunological basis for the WHO position on influenza vaccines. The influenza vaccine document comprises one module of the WHO Immunological Basis for Immunization series. We invite the immunization community to use these references, and we hope the influenza vaccine module will be a valuable resource for persons who manage and monitor influenza vaccine programs, particularly in low- and middle-income countries.