In an statement posted to his Instagram page, the former Racine chef patron said he was no longer involved in the group and was currently working on a new project that he hopes to be able to announce in the near future.
He said: "Dear friends, this week I stepped away from the London pubs that I have been running as chef director for the last three years and I no longer have any involvement in them.
"I am very proud of what we have achieved.
"A truly great team that have cooked and served great food and poured good drinks and I know will continue to do so.
"I am working on a new project that I hope to be able to announce before too long."
Harris partnered with Harcourt Inns, which is backed by private equity company Ducalian Capital, in 2017, initially to oversee the return of The Truscott Arms in Maida Vale.
However, as chef director he went on to take charge of the food offer across Harcourt's growing portfolio of pubs, which also includes The Three Cranes in the City of London; the Coach & Horses in Clerkenwell; and The Crown in Chiswick.
Harcourt Inns currently operates six pubs in total, with its most recent opening, The KPH in Notting Hill, opening last year.
Earlier this year Harris hosted a brief, one-day revival of his legendary London restaurant Racine, which closed its doors back in 2015, at the historic Chelsea Physic Gardens.