The word philanthropy comes from Ancient Greek φιλανθρωπία (philanthrōpía) 'love of humanity', from philo- 'to love, be fond of' and anthrōpos 'humankind, mankind'. In the second century CE, Plutarch used the Greek concept of philanthrôpía to describe superior human beings.

During the Middle Ages, philanthrôpía was superseded in Europe by the Christian virtue of charity (Latin: caritas) in the sense of selfless love, valued for salvation and escape from purgatory. Thomas Aquinas held that "the habit of charity extends not only to the love of God, but also to the love of our neighbor".

Sir Francis Bacon considered philanthrôpía to be synonymous with "goodness", correlated with the Aristotelian conception of virtue as consciously instilled habits of good behaviour. Samuel Johnson simply defined philanthropy as "love of mankind; good nature". This definition still survives today and is often cited more gender-neutrally as the "love of humanity."

In London, prior to the 18th century, parochial and civic charities were typically established by bequests and operated by local church parishes (such as St Dionis Backchurch) or guilds (such as the Carpenters' Company). During the 18th century, however, "a more activist and explicitly Protestant tradition of direct charitable engagement during life" took hold, exemplified by the creation of the Society for the Promotion of Christian Knowledge and Societies for the Reformation of Manners.

In 1739, Thomas Coram, appalled by the number of abandoned children living on the streets of London, received a royal charter to establish the Foundling Hospital to look after these unwanted orphans in Lamb's Conduit Fields, Bloomsbury. This was "the first children's charity in the country, and one that 'set the pattern for incorporated associational charities' in general." The hospital "marked the first great milestone in the creation of these new-style charities."

Jonas Hanway, another notable philanthropist of the era, established The Marine Society in 1756 as the first seafarer's charity, in a bid to aid the recruitment of men to the navy. By 1763, the society had recruited over 10,000 men and it was incorporated in 1772. Hanway was also instrumental in establishing the Magdalen Hospital to rehabilitate prostitutes. These organizations were funded by subscriptions and run as voluntary associations. They raised public awareness of their activities through the emerging popular press and were generally held in high social regard—some charities received state recognition in the form of the Royal Charter.
Philanthropists, such as anti-slavery campaigner William Wilberforce, began to adopt active campaigning roles, where they would champion a cause and lobby the government for legislative change. This included organized campaigns against the ill-treatment of animals and children and the campaign that succeeded in ending the slave trade throughout the Empire starting in 1807. Although there were no slaves allowed in Britain itself, many rich men owned sugar plantations in the West Indies, and resisted the movement to buy them out until it finally succeeded in 1833.

Financial donations to organized charities became fashionable among the middle class in the 19th century. By 1869 there were over 200 London charities with an annual income, all together, of about £2 million. By 1885, rapid growth had produced over 1000 London charities, with an income of about £4.5 million. They included a wide range of religious and secular goals, with the American import, YMCA, as one of the largest, and many small ones, such as the Metropolitan Drinking Fountain Association. In addition to making annual donations, increasingly wealthy industrialists and financiers left generou…

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The first corporation founded in the Thirteen Colonies was Harvard College (1636), designed primarily to train young men for the clergy. A leading theorist was the Puritan theologian Cotton Mather (1662–1728), who in 1710 published a widely read essay, "Bonifacius, or an Essay to Do Good". Mather worried that the original idealism had eroded, so he advocated philanthropic benefaction as a way of life. Though his context was Christian, his idea was also characteristically American and explicitly Classical , on the threshold of the Enlightenment.

Benjamin Franklin (1706–1790) was an activist and theorist of American philanthropy. He was much influenced by Daniel Defoe's An Essay upon Projects (1697) and Cotton Mather's Bonifacius: an essay upon the good (1710). Franklin attempted to motivate his fellow Philadelphians into projects for the betterment of the city: examples included the Library Company of Philadelphia (the first American subscription library), the fire department, the police force, street lighting, and a hospital. A world-class physicist himself, he promoted scientific organizations including the Philadelphia Academy (1751) – which became the University of Pennsylvania – as well as the American Philosophical Society (1743), to enable scientific researchers from all 13 colonies to communicate.

By the 1820s, newly rich American businessmen were initiating philanthropic work, especially with respect to private colleges and hospitals. George Peabody (1795–1869) is the acknowledged father of modern philanthropy. A financier based in Baltimore and London, in the 1860s, he began to endow libraries and museums in the United States and also funded housing for poor people in London. His activities became a model for Andrew Carnegie and many others.
Andrew Carnegie (1835–1919) was the most influential leader of philanthropy on a national (rather than local) scale. After selling his steel company in 1901 he devoted himself to establishing philanthropic organizations and to making direct contributions to many educational, cultural, and research institutions. He financed over 2,500 public libraries built across the United States and abroad. He also funded Carnegie Hall in New York City and the Peace Palace in the Netherlands.

His final and largest project was the Carnegie Corporation of New York, founded in 1911 with a US$25 million endowment, later enlarged to US$135 million. Carnegie Corporation has endowed or otherwise helped to establish institutions that include the Russian Research Center at Harvard University (now known as the Davis Center for Russian and Eurasian Studies), the Brookings Institution and the Sesame Workshop. In all, Andrew Carnegie gave away 90% of his fortune.
Other prominent American philanthropists of the early 20th ce…

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