He paid a visit to the Crown & Treaty in Uxbridge, west London on the afternoon of Friday 10 July after the manager invited him down for a pint to celebrate pubs reopening.
The pub is a part of the Old Spot Pub Company, in partnership with Ei Managed Investments, which is owned by Stonegate Pub Company.
General manager Leigh Phillips invited Johnson to visit the pub, which was refurbished during the three month closure period.
Phillips, said: “I was delighted the Prime Minister accepted my invitation to come and see how well we have adjusted to the ‘new normal’."
He added: “My team and our guests have all picked up our new processes quickly and it just goes to show how the determination and flexibility of our industry allow us to adapt quickly – even during a global pandemic.”
Prime Minister Boris Johnson spoke of the “great spirit” among staff and said they had “clearly worked incredibly hard” to implement safety measures.
Johnson added: “I know this has been an extremely difficult few months for pubs and so it was a real pleasure to be able to drop into the Crown & Treaty to offer my support following their reopening.
“Pubs are an important part of our local communities and the Government is determined to do what it can to support them.”