The 20-year-old, who spent time on loan at National League play-off finalists Solihull Moors last season, will be immediately loaned out to newly-promoted League One side Forest Green Rovers.
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The left-winger made 36 appearances in all competitions for Solihull, scoring five goals as he was named in the National League Team of the Season for the 2021-22 campaign.
A number of EFL clubs were interested in a loan deal for Boyes and Blades boss Paul Heckingbottom is delighted to have tied the player to a new contract at Bramall Lane.
“Harry came out and performed well in the National League last season and that prompted a number of EFL clubs to ask to loan him out this summer,” Heckingbottom said.
“We think this is a great opportunity for him at Forest Green in League One and are delighted to complete the deal, having seen him commit to his long-term future with United.”
On his move to Forest Green, Boyes said: “I am absolutely delighted to be here. This is my first opportunity to play in the EFL which will be a great new challenge.
“I was in the National League with Solihull last season and we did very well. I know Ian very well too having played against his teams a few times and his style of play suits me so I’m looking forward to it. be.”
Ian Burchnall, League One head coach, added: “I’m really happy to have Harry on board. He was a standout player in the Team of the Season last year and he’s had an exceptional year. with Solihull.
“Sheffield United value him really, really well and this is the next step in his development. We think he is more than capable of making the move, he can add a lot to the quality of the team, excellent on the ball and technically very gifted player”