Adam Weiler (died 1894) was a German trade unionist and socialist activist, active in London.
Born in Germany, Weiler emigrated to London, where he found work as a cabinetmaker.
He joined the International Working Men's Association, serving on its British Federal Council in 1872–3, and supporting Karl Marx and Friedrich Engels' campaign against reformers.
[4] Weiler represented the union on the London Trades Council, and was one of three delegates that body appointed to state the case for prisoners' defence.
[3] By 1884, Weiler was a member of the Manhood Suffrage League, and frequently spoke at meetings of various radical clubs in London.