Lionel Walter Rothschild, 2nd Baron Rothschild, Baron de Rothschild, was a British banker, politician, zoologist and soldier, who was a member of the Rothschild family. As a Zionist leader, he was presented with the Balfour Declaration, which pledged British support for a Jewish national home in Palestine. Rothschild was the president of the Board of Deputies of British Jews from 1925 to 1926.

The Rothschild family is a wealthy Ashkenazi Jewish noble banking family originally from Frankfurt that rose to prominence with Mayer Amschel Rothschild (1744–1812), a court factor to the German Landgraves of Hesse-Kassel in the Free City of Frankfurt, Holy Roman Empire, who established his banking business in the 1760s. Unlike most previous court factors, Rothschild managed to bequeath his wealth and established an international banking family through his five sons, who established businesses in London, Paris, Frankfurt, Vienna, and Naples. The family was elevated to noble rank in the Holy Roman Empire and the United Kingdom. The family's documented history starts in 16th century Frankfurt; its name is derived from the family house, Rothschild, built by Isaak Elchanan Bacharach in Frankfurt in 1567.