The University of Stamford was an academic institution founded in 1333 in Stamford, Lincolnshire, by a group of students and tutors from the University of Oxford, including Merton College and Brasenose Hall.

After lobbying by the universities of Oxford and Cambridge, King Edward III suppressed the institution in 1335 and the tutors and scholars were returned to Oxford. All Oxford graduates until the 1820s were required to take an oath not to lecture in Stamford.

According to John Hardyng, writing in the 1440s, the legendary British king Bladud studied in Athens before founding a university in Stamford. Later writers give possible dates of foundation in 863BC, and dissolution by Augustine of Canterbury in 605AD.

The legend is reflected in Edmund Spenser's 1590 poem The Faerie Queene in which he writes:

And shall see Stamford, tho’ now homely hid,
Then shine in learning more than ever did
Cambridge or Oxford, England’s goodly beams.

— Edmund Spenser, The Faerie Queene

However, no other evidence has been found of the existence of this institution.

In 1301, Edward I granted to the Gilbertines a manor on the north side of St Peter's Street, which they called Sempringham Hall. John Dalderby, Bishop of Lincoln, gave them licence to maintain at this hall "scholars ... studying the scriptures and philosophy".

There also seems to have been teaching at the Benedictine Priory of St Leonard, a cell of Durham Priory. The mother house also maintained Durham College, Oxford, and a few records survive recording payments to "scholars at Oxford and Stamford". There were also houses belonging to the Carmelite, Dominican and Franciscan orders of friars in the town. A manuscript of a commentary by William of Wheatley also records that he taught in Stamford in 1309, but this could refer to teaching in a grammar school.

Francis Peck and Hensley Henson have argued that the combined strength of these claustral institutions constituted "a university in all but name"; however, Hastings Rashdall considered this conclusion "essentially misleading".

In 1333, there was discord in Oxford, which seems to have been the result of conflict between students from Northern and Southern England. Following this, a group of students and tutors left Oxford in 1333 to found a rival college at Stamford. They were joined by more in 1334.

Surviving records suggest that the masters were nearly all from Northern England. Their leader was William de Barnby, a Yorkshireman who had been fellow and bursar of Merton College.

Oxford University petitioned Queen Philippa for help on 14 February 1334 [O.S. 14 February 1333], appealing that she and the king "let not the town of Oxford... be disinherited by the honour of another". Around the same time, similar petitions went to the Bishop of Lincoln and to King Edward III, referring to the "evil, which we think every way hurtful and pestilential, namely, the new assembly of scholars at the town of Stamford for university instructions", and appealing that "what was begun by improvident rashness may be quickly put an end to by the royal wisdom, and be a warning to future evil-doers".

On 2 August 1334, the king ordered the Sheriff of Lincolnshire, John of Trehampton, to go to Stamford and inhibit everyone, on pain of forfeiture of all their property, from performing any scholastic acts there. A similar message was also sent to the Mayor of Oxford. However, on 1 November, he was required to write again, saying he understood that masters and scholars continued in scholastic acts in Stamford. On 7 January, after apparent inaction, the king wrote to the sheriff to say he had appointed William Trussell to go with him and seize the goods of any disobedient clerks.

In an undated letter, "the clerks living in the town of Stamford" informed the king that they had travelled to Stamford "by reason of many controversies, contests and fights ... in Oxford", and studied there "in greater quiet and peace by sufferance of the noble John earl of Warenne". They appealed that "the king would allow his liegemen to remain there under his protection". A copy of this letter survived in the register of the Abbot of Peterborough, suggesting he may have had a role in supporting the rebels.

On 29 March 1335, the King issued a commission to Trussell to go to Stamford to suppress the students there, with an additional command to the sheriff to assist him. A number of students were expelled from Stamford, but Anthony Wood records that, after Trussell departed, the students were encouraged by the inhabitants of Stamford to return.

On 26 July 1335, an inquisition took place at Stamford before Trussell, which was able to name 38 clerks still in Stamford. The list includes seventeen Masters of Arts including William of Barnby; a Bachelor of Arts; five local parish priests; fifteen students (including the rector of Stanhope, County Durham); and "Philipus le maunciple atte Brasenose".

Robert de Stratford, chancellor of both England and of Oxford University, wrote to the masters of Cambridge University around 1337 regarding William of Barnby, whom he identified as "the principal instigator of the dangerous schism", and warning them not to grant degrees to him, saying that "if the said university of Stamford had lasted, it would have been to the disadvantage and dishonour of both universities".

Master of Arts students at Oxford were obliged to take an oath (in Latin); "You shall also swear that you will not read lectures, or hear them read, at Stamford, as in a University study, or college general". The 'Stamford oath' was used to maintain the long duopoly of Oxford and Cambridge and remained in place until 1827.

The antiquary Francis Peck in 1727 published annals of Stamford called Academia Tertia Anglicana (Latin for 'the third English university').

The only name on the list of scholars at the inquisition in 1335 given further description is "Philippus le manciple atte Brasenose". Leach and Madan take this to mean that a Brasenose Hall existed in Stamford as part of the nascent university; presumably formed by scholars from Brasenose Hall, Oxford, whose site would later become Brasenose College, Oxford.

Leach identifies this hall with a building known as Brazenose Hall or "The College", on St Paul's Street, Stamford; though there is no other evidence of use of this name before 1559, when a lease mentions "a messuage called Brassen Nose in St. Paul’s [parish], with all houses, barns, stables and other buildings". Oxford antiquary Brian Twyne visited the site in 1617, and recorded that the building carried the name of Brasenose, and had 'a fair refectory therein' and 'a great gate and a wicket; upon which wicket is a face or head of old cast brass with a ring through the nose thereof'.

This medieval building, having fallen into disrepair, was demolished in 1688, leaving a gate identified as dating from the early 14th century and bearing an ancient brass knocker. It was replaced with a house known as Brazenose Hall, or The College, which became the town workhouse before being demolished in 1822. The site, including the gate, then became the garden of the adjoining early 18th-century house, which took on the name "Brazenose House".

In 1890, Brasenose College, Oxford purchased the house in order to obtain the knocker. The knocker, which was assessed as dating from the 12th century, was removed from the gate and is now mounted above the high table in the college's dining hall in Oxford; a replica was placed on the gateway in Stamford in 1961.

The site, including the 18th-century house, was leased for a time to the private Brazenose School for Girls, then in 1929 was purchased by Stamford School and became part of the school site, giving its name to one of the school's senior houses. The "Site of Brazenose College" is a scheduled monument and the gate and retaining walls of the college are Grade I listed.

• Medieval university
• List of medieval universities
• University of Northampton (13th century)
• Third-oldest university in England debate