The 19-year old attacker joined Pools at the end of January but will now remain at Victoria Park until March 25.
Barmby has appeared five times for Colin Cooper’s side, scoring on his debut in a 2-0 win over York City on January 25.
A Pools statement on their official website read: “Jack Barmby will stay with Pools for a further month after a loan extension was agreed with his parent club Manchester United.
“The 19-year old has made five appearances since arriving at Victoria Park and will now remain with the Club until after the game with Mansfield Town on Tuesday 25th March.”
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