Former US vice-president Dick Cheney and ex-secretary of state Henry Kissinger are to attend Baroness Thatcher's funeral at St Paul's Cathedral, Downing Street announced.
The pair do not form part of Barack Obama's official presidential delegation, which will be led by George Shultz and James Baker, who both served as secretaries of state during the Thatcher era.
No members of the current White House administration are expected to attend.
Also on the list of attendees announced on Tuesday are Crown Prince Pavlos and Princess Marie-Chantal of Greece, two-time US presidential candidate Ross Perot and Olympics supremo Lord Coe.
Mr Cheney was vice-president under George W Bush from 2001-09, while Nobel Peace Prize winner Dr Kissinger served as national security adviser and later secretary of state in the administrations of presidents Richard Nixon and Gerald Ford from 1973-77.
Other attendees included ex-ministers from Lady Thatcher's administrations Sir Malcolm Rifkind, Peter Lilley and Baroness (Virginia) Bottomley, as well as former Liberal Democrat leader Sir Menzies Campbell, ex-Ulster Unionist leader Lord Trimble and former Commons Speaker Baroness Boothroyd.
Political correspondent-turned-reality TV star John Sargeant - whose live TV broadcast was famously hijacked in 1990 by Lady Thatcher declaring she would fight on to keep the Tory leadership - will also be present, as will BBC director-general Lord Hall and BBC Trust chairman and former Conservative chair Lord Patten.
Senior peer Baroness Trumpington, the ex-chair of the Joint Intelligence Committee Sir Alex Allan, businessman Sir David Tang and former Conservative Party officials Lord Beaverbrook and Raymond Monbiot are also due to attend.