LONDON — Eighty-three employees of Barclays or Barclays Capital have donated to Mitt Romney’s presidential campaign, according to Federal Election Commission records.

Romney’s close association with the troubled bank’s former chief executive, Bob Diamond, has been widely reported.

Diamond was scheduled to cohost a fund-raiser for Romney in London but withdrew after he came under fire amid reports that the bank was involved in manipulating a key market index, the London interbank offered rate, known as Libor.

Diamond has donated $2,500 to Romney’s campaign.

The nonpartisan Center for Responsive Politics said that another Barclays executive stands at the top of the pile of ‘‘bundlers,’’ people who solicit large numbers of contributions and send them on in a lump sum to a campaign.

Patrick J. Durkin, managing director for Barclays Capital, has drummed up more than $1.1 million for Romney, it said.

According to FEC records, Durkin, a registered lobbyist for Barclays, personally contributed $2,500 to the campaign last year and $25,000 this year to Romney’s ‘‘victory fund,’’ which is subject to a higher maximum of $30,800 per election, whether a primary or the general election.