John Eyre (died 1685) was a Cromwellian settler in Ireland who became Mayor of Galway.
Eyre was born in Wiltshire, England, in the early 17th century, the son of Giles Eyre and Jane Snelgrove. The couple had ten sons and five daughters, John been the seventh son. The attended All Saints Church, Whiteparish, where Giles and Jane are buried. Their funerary memorial, located within the church, reads:
Buried here Gyles Eyre Esqre and Jane his wife. A man much oppressed by publick power for his laudable opposition to the measures taken in the reigns of James I and Charles I In the year 1640 (for then well known Court reasons) He was ... afterwards plundered at Brickworth of 2000 l. value and imprisoned for refusing to pay the sum of 400 l. illeg 1572 dyed Jan 1655 having issue 7 sons (3 of whom were likewise members of Parliament) and 4 daughters.
Eyre and his younger brother Edward were officers in the forces of the Parliament, Eyre rising to the rank of major. In 1649 the brothers arrived in Dublin as part an invasion force of 12,000 men led by Oliver Cromwell. They saw service mainly under the command of Edward Ludlow.
Eyre is mentioned as one of the officers with Ludlow when he arrived at Galway in 1651. With the surrender of the town in April 1652 the war ended, and the brothers began securing much property seized from Irish Roman Catholics, within the town and also in other parts of County Galway. Much land was made over to Cromwellian officers who were owed substantial pay arrears. Eyre's main landed estates were in the south-east of the county, dispossing families such as Kelly, Madden, Horan, and Burke. In this area, known in Irish as Síol Anmchadha, Eyre created the town of Eyrecourt and his main residence. This would continue to be the home of generations of the family.
John and Edward Eyre were both returned as members of the Irish parliament in 1661, and John moved strongly to help preserve the settlements that had allowed them to become men of substance. However, he was absent on a number of occasions, apparently due to a serious dispute involving his brother, and Robert Martin of Ross, back in Galway.