Postman's Park is a public garden in central London, a short distance north of St Paul's Cathedral. Bordered by Little Britain, Aldersgate Street, St. Martin's Le Grand, King Edward Street, and the site of the former headquarters of the General Post Office (GPO), it is one of the largest open spaces in the City of London.

Postman's Park opened in 1880 on the site of the former churchyard and burial ground of St Botolph's Aldersgate church and expanded over the next 20 years to incorporate the adjacent burial grounds of Christ Church Greyfriars and St Leonard, Foster Lane, together with the site of housing demolished during the widening of Little Britain in 1880; the ownership of the last location became the subject of a lengthy dispute between the church authorities, the General Post Office, the Treasury, and the City Parochial Foundation. A shortage of space for burials in London meant that corpses were often laid on the ground and covered over with soil, thus elevating the park above the streets which surround it.

In 1900, the park became the location for George Frederic Watts's Memorial to Heroic Self-Sacrifice, a memorial to ordinary people who died while saving the lives of others and who might otherwise be forgotten, in the form of a loggia and long wall housing ceramic memorial tablets. Only four of the planned 120 memorial tablets were in place at the time of its opening, with a further nine tablets added during Watts's lifetime. Watts's wife, Mary Watts, took over the management of the project after Watts's death in 1904 and oversaw the installation of a further 35 memorial tablets in the following four years along with a small monument to Watts. Later she became disillusioned with the new tile manufacturer and, with her time and money increasingly occupied by the running of the Watts Gallery, she lost interest in the project, and only five further tablets were added during her lifetime.

In 1972, key elements of the park, including the Memorial to Heroic Self-Sacrifice, were Grade II listed to preserve their character, upgraded to Grade II* in 2018. Following the 2004 film Closer, based on the 1997 play Closer by Patrick Marber, Postman's Park experienced a resurgence of interest; key scenes of both were set in the park itself. In June 2009, a city worker, Jane Shaka (née Michele), via the Diocese of London added a new tablet to the Memorial, the first new addition for 78 years. In November 2013 a free mobile app, The Everyday Heroes of Postman’s Park, was launched which documents the lives and deaths of those commemorated on the memorial.

Historical background The 13th-century church of St Leonard, Foster Lane, about north of St Paul's Cathedral on Foster Lane, was badly damaged in the 1666 Great Fire of London, and was not considered to be worth the cost of repair. Instead its parish was united with that of the nearby Christ Church Greyfriars, which was rebuilt after the fire to a design by Sir Christopher Wren; the incumbent from that time onwards has held the joint titles of Vicar of Christ Church Greyfriars and Rector of St Leonard, Foster Lane. Although destroyed in 1666, the ruins of St Leonard, Foster Lane, were not cleared until the early 19th century.

Despite the unification of the parishes, they continued to operate separate burial grounds. That of Christ Church Greyfriars was a short distance north-east of the church, on the eastern side of King Edward Street, while St Leonard, Foster Lane's, was about further east.

Immediately outside the London Wall at Aldersgate, a short distance north of St Leonard, Foster Lane on Little Britain, is the church of St Botolph's Aldersgate (also known as "St Botolph without Aldersgate", in reference to its position immediately outside the historic city gate). Although the original church, first mentioned in 1493, had survived the Great Fire, it was demolished between 1754 and 1757 and replaced in 1790 by the current building.

St Botolph's Aldersgate was a wealthy parish, having been granted the assets of the nearby Cluniac priory and hospital during the 16th-century Dissolution of the Monasteries. The parish was historically a significant place of worship, possibly best known as the site of the evangelical conversions of John Wesley and Charles Wesley.

To the immediate south-west of the church building, St Botolph's Aldersgate owned an irregularly shaped churchyard enclosed by Aldersgate Street to the east, the Christ Church Greyfriars burial ground to the west, housing and the burial ground of St Leonard, Foster Lane, to the south and housing along Little Britain to the north. The churchyard was used as a burial ground and as a public open space. As with other City churchyards, as the amount of available burial space in London failed to keep pace with the growing population it came to be used exclusively as a burial ground.

Postman's Park has always been situated in the ward of Aldersgate. Its association with (and location within) that ward was reaffirmed in the most recent boundary review that took place in 2010; the ward boundary will be drawn around the southern edge of the park upon boundary changes effected in 2013.City of London Corporation  — City of London Ward Boundary Review: Final recommendations

Closure of London's burial grounds

The severe lack of burial space in London meant that graves would be frequently reused in London's burial grounds, and the difficulty of digging without disturbing existing graves led to bodies often simply being stacked on top of each other to fit the available space and covered with a layer of earth. Differing numbers of parishioners in each parish led to burial grounds being used at different rates, and by the mid-19th century, the ground level of the St Botolph's Aldersgate churchyard was above that of the Christ Church Greyfriars burial ground, and above that of the St Leonard, Foster Lane, burial ground.

In 1831 and 1848, serious outbreaks of cholera had overwhelmed the crowded cemeteries of London, causing bodies to be stacked in heaps awaiting burial, and even relatively recent graves to be exhumed to make way for new burials. Public health policy at this time was generally shaped by the miasma theory, and the bad smells and risks of disease caused by piled bodies and exhumed rotting corpses caused great public concern.

A Royal Commission established in 1842 to investigate the problem concluded that London's burial grounds were so overcrowded that it was impossible to dig a new grave without cutting through an existing one. Sir Edwin Chadwick testified that each year, 20,000 adults and 30,000 children were being buried in less than of already overcrowded burial grounds; the Commission heard that one cemetery, Spa Fields in Clerkenwell, designed to hold 1,000 bodies, contained 80,000 graves, and that gravediggers throughout London were obliged to shred bodies in order to cram the remains into available grave space.

Burial Act 1852

In the wake of public concerns following the cholera epidemics and the findings of the royal commission, the Burial Act 1852 was passed. Under the Burials Act, new burials were prohibited in what were then the built-up areas of London. Seven large cemeteries had recently opened a short distance from London and temporarily became London's main burial grounds, and in 1849 the Brookwood Cemetery in Brookwood, Surrey, with space for 240,000 graves, was opened by the London Necropolis Company. Connected to London by the London Necropolis Railway in 1854, it was at the time the world's largest cemetery. It was projected that, on the basis of one body per grave with each grave being reused after 10 years, Brookwood Cemetery would suffice to house the dead of London forever.

With London's churchyards and burial grounds no longer used for new burials, in 1858 it was decided to convert the churchyard of St Botolph's Aldersgate to a public park. On 30 November 1858, the Churchwardens of St Botolph's Aldersgate announced that:

Opening of the public park

Progress in clearing and covering the burial ground was slow, and it was not until 28 October 1880 that the churchyard was reopened as a public park. Laid out with flower beds and gravel paths, the park became a popular place for local workers to spend breaks.

In 1887, the burial ground of Christ Church Greyfriars was given to the parish of St Botolph's Aldersgate. The burial ground was cleared and the ground level raised by to allow its incorporation into the new park. At this time, the burial ground of St Leonard, Foster Lane was also cleared and raised to integrate it with the new park, although it was not formally merged with the park until 1890.

A short distance south of the three burial grounds, on St. Martin's Le Grand, was the site of a collegiate church and sanctuary founded in 750 by Withu, King of Kent, expanded in 1056 by Ingebrian, Earl of Essex and issued with a Royal Charter in 1068 by William the Conqueror. The site of the church was cleared in 1818 in preparation for the construction of a new headquarters and central sorting office for the General Post Office (GPO), which opened in 1829. In 1873 and 1895 the GPO building was greatly expanded in size, with the 1895 extension bordering the southern edge of the park itself. The park became extremely popular with workers in the GPO building, and soon became known as "Postman's Park".

The City Parochial Foundation and the north of the park

Between the northern border of the former St Botolph's Aldersgate churchyard and Little Britain was a small, roughly triangular piece of land. The site of housing owned by the parish of St Botolph's Aldersgate and demolished during the widening of Little Britain in 1880, it had been incorporated into the new park. However, being owned by the parish, in 1891 ownership was formally passed to the newly formed City Parochial Foundation (CPF), which felt itself obliged under charity law to maximise its income from the land. In October 1896, the CPF fenced off the land from the rest of the park, and announced that it intended to lease the land for building purposes, unless the authorities were willing to purchase the land for £12,000 (about £ as of ).

The City of London had few open spaces, and the proposal to build on the north of the park was extremely unpopular with local residents, workers and social reformers. Henry Fitzalan-Howard, the Postmaster-General, persuaded the Government to contribute £5,000 towards the cost, and the clergy of St Botolph's Aldersgate launched an appeal in The Times for the remaining funds.

Reginald Brabazon, 12th Earl of Meath, founder and Chairman of the Metropolitan Public Gardens Association (MPGA), decided to put the weight of his organisation behind the campaign, and through a combination of public donations and donations from the London County Council, Corporation of London and Kyrle Society, raised the remaining £7,000 in less than six months. At this point a dispute broke out over who would be responsible for the maintenance of the park. The £5,000 offer from the Treasury was conditional upon the CPF reassigning to the Post Office the £200 annual maintenance grant that it currently gave to St Botolph's Aldersgate; the CPF maintained that it was happy to do so on condition that the Post Office maintain the park in place of St Botolph's Aldersgate, but that the Post Office was unwilling to do so. With all parties unable to agree on responsibility for maintenance, on 19 February 1898 the Treasury withdrew its offer altogether, leaving the appeal £5,000 short.