The Grand Tour was the principally 17th- to early 19th-century custom of a traditional trip through Europe, with Italy as a key destination, undertaken by upper-class young European men of sufficient means and rank (typically accompanied by a tutor or family member) when they had come of age (about 21 years old). The custom—which flourished from about 1660 until the advent of large-scale rail transport in the 1840s and was associated with a standard itinerary—served as an educational rite of passage. Though it was primarily associated with the British nobility and wealthy landed gentry, similar trips were made by wealthy young men of other Protestant Northern European nations, and, from the second half of the 18th century, by some North and South Americans.

By the mid-18th century, the Grand Tour had become a regular feature of aristocratic education in Central Europe as well, although it was restricted to the higher nobility. The tradition declined in Europe as enthusiasm for classical culture waned, and with the advent of accessible rail and steamship travel—an era in which Thomas Cook made the "Cook's Tour" of early mass tourism a byword starting in the 1870s. However, with the rise of industrialization in the United States in the 19th century, American Gilded Age nouveau riche adopted the Grand Tour for both sexes and among those of more advanced years as a means of gaining both exposure and association with the sophistication of Europe. Even those of lesser means sought to mimic the pilgrimage, as satirized in Mark Twain's popular travel book The Innocents Abroad in 1869.

The primary value of the Grand Tour lay in its exposure to the cultural legacy of classical antiquity and the Renaissance, and to the aristocratic and fashionably polite society of the European continent. It also provided the only opportunity to view specific works of art, and possibly the only chance to hear certain music. A Grand Tour could last anywhere from several months to several years. It was commonly undertaken in the company of a cicerone, a knowledgeable guide or tutor.

Rome for many centuries had already been the destination of pilgrims, especially during Jubilee when European clergy visited the Seven Pilgrim Churches of Rome.

In Britain, Thomas Coryat's travel book Coryat's Crudities (1611), published during the Twelve Years' Truce, was an early influence on the Grand Tour but it was the far more extensive tour through Italy as far as Naples undertaken by the 'Collector' Earl of Arundel, with his wife and children in 1613–14 that established the most significant precedent. This is partly because he asked Inigo Jones, not yet established as an architect but already known as a 'great traveller' and masque designer, to act as his cicerone (guide).

Larger numbers of tourists began their tours after the Peace of Münster in 1648. According to the Oxford English Dictionary, the first recorded use of the term (perhaps its introduction to English) was by Richard Lassels (circa 1603–1668), an expatriate Roman Catholic priest, in his book The Voyage of Italy, which was published posthumously in Paris in 1670 and then in London. Lassels's introduction listed four areas in which travel furnished "an accomplished, consummate Traveller": the intellectual, the social, the ethical (by the opportunity of drawing moral instruction from all the traveller saw), and the political.

As a young man at the outset of his account of a repeat Grand Tour, the historian Edward Gibbon remarked that "According to the law of custom, and perhaps of reason, foreign travel completes the education of an English gentleman." Consciously adapted for intellectual self-improvement, Gibbon was "revisiting the Continent on a larger and more liberal plan"; most Grand Tourists did not pause more than briefly in libraries. On the eve of the Romantic era he played a significant part in introducing, William Beckford wrote a vivid account of his Grand Tour that made Gibbon's unadventurous Italian tour look distinctly conventional.

The typical 18th-century stance was that of the studious observer travelling through foreign lands reporting his findings on human nature for those unfortunates who stayed at home. Recounting one's observations to society at large to increase its welfare was considered an obligation. The Grand Tour flourished in this mindset. In essence, the Grand Tour was neither a scholarly pilgrimage nor a religious one. Grand Tourists in the 18th century frequently traveled with entourage, which could include tutors and servants, but still Grand Tourists used guide books. Popular guide book for the Grand Tour were prolifically published from the mid 18th century onward, though guide books for major Italian cities had been in circulation since 1660. These also frequently included detailed urban maps, increasingly facilitating more independent and self-guided experiences of cities and their ruins. Grand Tour guide books were used by young aristocrats, but had the bourgeoisie purpose of helping the reader make an authoritative choice. Grand Tour hot spots were Paris and Rome. European capital cities were Grand Tour stop overs frequently requiring traveling across the Alps and forcing Grand Tourists to gaze at length at natural sights such as Mount Etna and Mount Vesuvius. Climbing mountains, crossing rivers, and purchasing souvenirs were part of the traveling experience.