The former British spy behind the shocking dossier about Donald Trump is “terrified for his safety” after being identified Wednesday, a report says.

Christopher Steele, 52, has gone into hiding after being publicly named in a story by the Wall Street Journal, according to the Telegraph.

Sources said the ex-MI6 agent has fled his home in Surrey, which borders London, and is now on the run.

The Journal reported Wednesday that Steele had prepared the 35-page dossier — alleging Russia had compromising information on Trump — and handed it over to officials in the US and Europe.

The former intelligence operative was posted in the UK’s Moscow embassy in the 1990s and was said to have personally compiled the memos in the document.

Steele — who is currently serving as director of the London-based private investigative firm Orbis Business Intelligence — now fears for his life and expects backlash from Russia, the Telegraph reports.

He fled his home Wednesday morning shortly before the Journal identified him, after realizing his name would eventually become public, sources said.

One insider told The Sun that Steele was “horrified” when his name was released, and that he is also “terrified” for “his family’s safety.”

A neighbor of his reportedly said the ex-spy was expected to be gone for a few days.