Lewis Hippolytus Joseph Tonna (3 September 1812 – 2 April 1857) was an English polyglot and campaigner on behalf of evangelical protestantism.
Born Liverpool, son of the Spanish vice-consul and consul for the Kingdom of the Two Sicilies, his father died in 1828 while he was a student in Corfu and he was compelled to find employment as an interpreter aboard the Hydra.
He served on various ships until returning to England in 1835 to become a director of the Royal United Services Institute.
[1] Tonna married Charlotte Elizabeth Browne, a widow, in 1841 and the two were prolific pamphleteers for the evangelical Protestant cause.
[1] When Giacinto Achilli was interned following the fall of the Roman Republic, Tonna was prominent in the campaign for his release and return to England.