The 21-year old striker spent time on loan with the Terriers in November but after being released by City, has been able to sign a deal with them until the end of the season.
"We were pleased with what we saw of Harry and he did well in a short space of time," Huddersfield boss Mark Robins told the club's official website.
"He fitted in well with the group and caught the eye in his performances for the under-21s.
"Although our first-team supporters didn't get the chance to see him, the loan period proved to be extremely worthwhile for us.
"We believe Harry can develop further and we'll work hard with him on the training ground to aid that development.
"We will now continue to monitor Harry's progress here for the rest of the season, it's a good opportunity for Harry."
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