Samuel Montagu, 1st Baron Swaythling (21 December 1832 – 12 January 1911) was a British banker who founded the bank of Samuel Montagu & Co. He was a philanthropist and Liberal politician who sat in the House of Commons from 1885 to 1900, and was later raised to the peerage. Montagu was a pious Orthodox Jew, and devoted himself to social services and advancing Jewish institutions.
Montagu was born in Liverpool as Montagu Samuel, the second son of Louis Samuel, a watchmaker of Liverpool, and his wife, Henrietta Israel, daughter of Israel Israel of Bury Street, St. Mary Axe, London. He was educated at the High School of Liverpool Mechanics' Institute as Samuel Montagu. In 1853 he founded the bank of Samuel Montagu as a foreign banker.
Montagu's commitment to Jewish causes included both initiatives aimed at improving the lot of Jews in England, and his participation in the proto-Zionist "Lovers of Zion" movement. He was involved in founding new synagogues, and in establishing the Federation of Synagogues, which was an umbrella body for the small Orthodox congregations in the East End of London.
He was elected at the 1885 general election Liberal Member of Parliament (MP) for Whitechapel, and held the seat until he stood down at the 1900 general election. From 1887 to 1890, he was a member of the Gold and Silver Commission. He was created a Baronet, of South Stoneham House in the County of Southampton and of Kensington Palace Gardens in the County of London, on 23 June 1894.