LONDON — A British financial regulator barred a former trader at Deutsche Bank from the country’s financial services industry on Wednesday, after he pleaded guilty last year to criminal charges in the United States over a scheme to manipulate the global benchmark interest rate known as Libor.

A half-decade investigation into the manipulation of the London interbank offered rate, or Libor, has led to billions of dollars in fines and has damaged the reputations of some of the world’s biggest banks, including Barclays, the Royal Bank of Scotland and UBS. Deutsche Bank itself agreed in April to pay $2.5 billion in penalties to resolve an inquiry by British and American authorities into the manipulation of Libor. The bank’s British subsidiary also agreed to plead guilty in the matter.

On Wednesday, the Financial Conduct Authority said it had barred the former Deutsche Bank trader, Michael R. Curtler, a British citizen, from the industry for “lacking honesty and integrity.” He pleaded guilty in the United States in October to a single count of conspiracy to commit wire fraud and bank fraud.

In a charging document, the United States Justice Department accused Mr. Curtler of engaging in a conspiracy to manipulate Libor, the average rate at which banks can borrow from one another, from 2003 to 2011. Mr. Curtler awaits sentencing.