A sombre-looking Mr Clegg said he had "never shirked from the political battlefield" and warned of the "agonising" future ahead for the next government that seeks to unite a divided country.
Early reports had claimed the former Deputy Prime Minister might lose the seat, according to a Lib Dem source, but now it has been confirmed.
O'Mara got 21,881 votes (38.37%) compared to Clegg's 19,756 (34.65%).
"But I have, of course, encountered this evening something that many people have encountered before me tonight... you live by the sword, you die by the sword". "I have no intention of giving up and neither do the Liberal Democrats", he said this week, predicting that public opinion would turn as "people begin to feel the Brexit squeeze". But many of those seem to have voted Labour instead.
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The poll, which has sent the pound plunging in trading, predicts the Tories will be the largest party but may not win a majority amid gains for Labour and the Lib Dems.
Mr Clegg had appeared relaxed about his prospects in the final days of the campaign, visiting other seats and using a speech in London to set out his case against Brexit. "History will judge him more kindly than you lot are about to".
Labour's pledge on university fees are said to have been a major drawcard for the student-majority constituency.
Former deputy British prime minister and former leader of the Liberal Democrats Nick Clegg has lost his seat of Hallam to become the highest profile figure so far to lose a seat after a Labour surge in the United Kingdom elections.
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