The talented wide-man has signed a youth loan at Oakwell until May 8th, 2016, and Caretaker Head Coach Paul Heckingbottom told of his delight at capturing the Boro starlet.
"I'm delighted to have Harry join us," said Heckingbottom. "He is an exceptional talent and is very highly thought of at Middlesbrough. We're very grateful to them for allowing him to join us.
"I'm sure he can prove valuable for us as we head into the final run-in, and hopefully we will prove valuable to him in his development as a promising young footballer."
Chapman was the shining light of Boro's UEFA Youth Cup campaign, scoring a stunning solo goal against Torino, and has been in blistering form for the Riverside Club's youth teams over the course of the season.
The 18-year-old will wear squad number 32 and looks set to make his debut this weekend against Crewe Alexandra.
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