The Lamb & Flag is the name of a public house at 12 St Giles', Oxford, England. It is owned by St John's College, and profits fund DPhil student scholarships.
The pub lies just north of St John's College, who manage it. The Lamb & Flag Passage runs through the south side of the building, connecting St Giles' with Museum Road, where there is an entrance to Keble College to the rear of the pub.
Since St John's took over the management of the pub in 1997, a Lamb & Flag scholarship has been instituted for graduate students.
The name of the pub comes from the symbol of Christ as the victorious Lamb of God (Agnus Dei) of the Book of Revelation, carrying a banner with a cross, and often gashed in the side. This is also a symbol of St John the Baptist, and so is emblematic of ownership by the College of St John the Baptist.