The National Anti-Vaccination League (NAVL) was a British anti-vaccination organization that was formed in 1896 from earlier smaller organizations. Historically, the League had opposed compulsory vaccination, particularly against smallpox. It was part of a wider anti-vaccinationist movement, arguing that vaccination did more harm than good.
The National Anti-Vaccination League grew from earlier smaller organizations in London, originally under the title Anti-Compulsory Vaccination League (ACVL) in response to the government making smallpox vaccination compulsory. The Anti-Compulsory Vaccination League was founded by Richard Butler Gibbs at Finsbury in 1866. Members included Richard's brother George Sleight Gibbs and his cousin John Gibbs, author of the first anti-vaccination pamphlet. The Anti-Compulsory Vaccination League had 103 branch leagues and claimed 10,000 members in 1871.