A defender from Norwich, Harry Barker was with Norwich City since the age of nine. Described as a strong and athletic defender who likes to get forward and support attacks, Harry has been a regular at under-16 level this season. On 31st March 2011, it was announced that he and eight others would join Norwich's Academy in the summer of 2011. Academy manager Ricky Martin said: “I would like to wish all nine boys the best of luck and hope they enjoy long and successful careers at Norwich City.”

Barker played in both FA Youth Cup semi-final matches against Notts Forest which the Canaries won to progess to the FA Youth Cup final

He was then part of the Norwich City Under-21 Development Squad.

Barker was released at the end of the 2013/14 season

On 24th July 2014, Barker trialled with AFC Sudbury in a memorial game for Aaron Gardiner against Bury Town. He then signed for Dereham.

By the summer of 2015, he had signed for Lowestoft.

In March 2018, Barker left Lowestoft to join Norwich United.

In June 2022 he signed for Wroxham.