Spanish flu (disambiguation)

Spanish flu or Spanish influenza, also known as purulent bronchitis, may refer to:


 * the 1918 flu pandemic where 500 million people worldwide were infected with H1N1 influenza A virus between 1918 and 1920, killing from 20 to 100 million people
 * the Influenza A virus subtype H1N1 which caused the influenza pandemic between 1918 and 1920, as well as the 2009 swine flu pandemic and 1977 Russian flu pandemic