Nathaniel Philip Victor James Rothschild, 5th Baron Rothschild (born 12 July 1971), known as Nathaniel Philip Rothschild or Nat Rothschild, is a British-born Canadian financier, who is a birth member of the Rothschild family's banking family of England. He has settled in Switzerland and is also a naturalised Montenegrin citizen.

Lord Rothschild became the 5th Baron Rothschild on the death of his father, on 26 February 2024. The heir presumptive is Lord Rothschild's first cousin, James Rothschild (born 1985), the only son of his half-uncle, Amschel Rothschild (1955–1996), who has been married to Nicky Hilton, a member of the prominent Hilton family, since 10 July 2015. The heir presumptive's heir apparent is his only son, Chasen Rothschild (born 2022).