Sir Isaac Lyon Goldsmid, 1st Baronet (born January 13, 1778,London, England—died April 27, 1859, London) was a financier andBritain’s first Jewish baronet, whose work for Jewish emancipation in that nation made possible the passage of theJewish Disabilities Bill of 1859, granting basic civil and political rights to Jews.

Highly successful as a dealer inprecious metals withPortugal,Brazil, and Turkey, Goldsmid became active in the cause of Jewish emancipation and social reform. After passage of the Act of 1829, providingcivil rights for Roman Catholics inEngland, he sought and made possible the passage of a similar measure for Jews.

Goldsmid also worked for reform of the penal system and was one of the founders of University College, London, in 1826. In 1841 he was made the first Jewish baronet. His son,Sir Francis Henry Goldsmid (1808–78), worked with him for Jewish emancipation and was the first Jewish barrister in England.