A nationally known finance executive who served in the Treasury Department under President George W. Bush is in line to become the city’s next deputy mayor for economic development, The Post has learned.

Sources said Robert Steel, 58, is the leading contender to replace Robert Lieber, who announced last month that he will be leaving to join a friend’s investment firm.

If Steel gets the job, he would arguably be the best-credentialed economic-development chief in city history.

His bulky résumé includes stints as a vice chairman at Goldman Sachs, CEO of Wachovia Corp. and treasury undersecretary for domestic finance in Bush’s administration.