Rajapakse had travelled to London on Tuesday ahead of an address to the prestigious Oxford Union on Thursday, but the organisers said security considerations forced them to cancel his appearance.
"I am very sorry this has had to be canceled, but I will continue to seek venues in Britain and elsewhere where I can talk about my future vision for Sri Lanka," the president's office quoted him as saying.
Rajapakse's top aide, Lalith Weeratunga, said the Oxford Union had cancelled the talk following pressure from elements supporting Sri Lanka's defeated separatist Tamil Tiger rebels.
Sri Lanka's minority Tamil community in London had planned a demonstration to coincide with Thursday's event.
They also staged a protest when Rajapakse arrived in London on Tuesday.
"This (cancellation) is a decision that has been made unilaterally by the Oxford Union, reportedly as a result of pressure applied by pro-LTTE (Liberation Tigers of Tamil Eelam) activists," Weeratunga said.
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