Sir Basil Phillott Blackett KCB KCSI (8 January 1882 – 15 August 1935) was a British civil servant and expert on international finance.

He went to America for the first time in October 1914 in connection with foreign exchange matters and was made a Companion of the Bath (CB) in the 1915 New Year Honours.

He was a member of the Anglo-French Financial Commission, which went to America in 1915 and so when the United States entered the war in 1917, he was seen as the natural choice to represent HM Treasury in Washington.

He put the Indian railways on an independent footing, concentrated the charges for the public debt into a statutory sinking fund, and set up a conference bringing together the eight provincial finance members for the first time to compare and co-ordinate their problems.

His friend Montagu Norman, then governor of the Bank of England, sponsored his election to the court of directors, and he became chairman of the new Imperial and International Communications Limited.

In August 1935, Blackett died in Marburg where he was taken to after his car was hit by a train in the Lumda valley in Germany on his way to giving a lecture at Heidelberg University.