
An arboretum in a general sense is a botanical collection composed exclusively of trees. More commonly, a modern arboretum is a botanical garden containing living collections of woody plants and is intended at least in part for scientific study. The term arboretum was first used in an English publication by John Claudius Loudon in 1833 in The Gardener's Magazine but the concept was already long-established by then.

The Arboreti di Vallombrosa are seven arboreta located within the Forest Demaniale Vallombrosa near the historic Vallombrosa Abbey founded in 1036 by St. John Gualbert of Visdomini, heavenly patron of the Italian Forestry Corps. They are located in Vallombrosa, Reggello, Province of Florence, Tuscany, Italy, operated by the Carabinieri Department for Biodiversity of Vallombrosa. During the summer months there are free guided tours every day, in all other periods upon prior request.

The Arboretum Kalmthout is a botanical garden in Kalmthout, Belgium. It was started as a tree plantation by Charles Van Geert in 1856. Van Geert developed a collection of rare plants and trees before selling the property after 40 years to Antoine Kort. Kort added an extensive collection of Hamamelis or witch hazel to the nursery, but was forced to close his business due to the Great Depression of the 1930s. In 1952, the property was purchased by the brothers Georges and Robert de Belder, to save it from being destroyed by a housing development. At the site, the year that they purchased the property, the de Belder brothers founded the International Dendrology Society (IDS) to promote preservation and conservation of rare or endangered woody plants. Robert de Belder and his wife, Jelena de Belder-Kovačič worked together to build an internationally known arboretum, where plant enthusiasts could study and exchange knowledge and information about plants. In 1986 it became property of the Antwerp province and is now open to public.

The Arboretum La Alfaguara was formerly a tree nursery in the Sierra de la Alfaguara, in Alfacar near Granada in Spain. It contains samples of many of the trees that are scattered throughout the Sierra and the surrounding mountain ranges.

Arboretum Norr is an arboretum in Baggböle, Sweden, on the Ume River, about eight kilometers west of Umeå city centre.

The Arboretum Vrahovice is a small arboretum in Vrahovice, Czech Republic.
The Arboretum is a botanical garden, public park and arboretum in Switzerland. The garden is part of the so-called Quaianlagen, a series of lakefronts in Zürich. The area also houses a lido, a public bath with a lake sauna, and the Voliere Zürich including the Vogelpflegestation, a unique sanatorium for birds.

Buçaco Forest is an ancient, walled arboretum in the Centro region of Portugal and home to one of the finest dendrological collections in Europe. The forest measures 1450 meters by 950 meters and covers an area of 105 hectares; the perimeter wall is approximately 5 kilometres (3.1 mi) in circumference and punctuated by a series of gates, one of which bears the text of 17th-century papal bulls forbidding women to enter and threatening to excommunicate anyone harming the trees. More than 250 tree and shrub species grow in the forest, including huge centenarians and exotics introduced by Portuguese mariners during the Age of Discovery. In 2004 Portugal submitted Buçaco Forest to UNESCO's tentative list of World Heritage Sites.

The Gothenburg Botanical Garden is located in Gothenburg, Sweden, and is one of the larger botanical gardens in Europe.

Hallormsstaður National Forest or Hallormsstaðaskógur [-ˌstaːðaˌskouː(ɣ)ʏr̥] is located in Fljótsdalur east Iceland, about 25 kilometers inland from the town of Egilsstaðir. It is one of the larger forests in Iceland, covering 740 hectares (ha), and includes the only village in Iceland that is located in a forest. The forest is a recreation area in a varied landscape. There are over 40 km of marked trails and footpaths as well as an arboretum, two camp-sites, picnic areas, a hotel, and boat and horse rentals.
Ijevan Dendropark also known as Ijevan Subtropical Arboretum, is an arboretum located in Ijevan, Tavush Province, Armenia. Located on the right bank of Aghstev river, it was founded in 1962 by Mushegh Aghinyan, Griror Adamyants and Lyudvig Sayadyan.

Jade Garden is an arboretum located in Chuncheon, South Korea. The garden opened in April 2011. Jade Garden provides walk-through tours and experimental programs, including gardening. The garden is recognised as the filming site of popular Korean television dramas such as That Winter, the Wind Blows, Angel's Last Mission: Love and Young Lady and Gentleman.

The John F. Kennedy Arboretum on the Hook Head Peninsula at New Ross, County Wexford, Ireland, is a park under public administration.

Kalsnava Arboretum is an arboretum in Kalsnava Parish, Madona Municipality, Latvia.
Lindenhof in Rapperswil is a moraine hill and a public square being the historic center of Rapperswil, Switzerland.

The Lussich Arboretum is an arboretum of 192 hectares located in the Maldonado Department of Uruguay near Punta del Este and Punta Ballena.

Luua Arboretum is an arboretum in Luua, Estonia.

The Mardakan arboretum is located in the Mardakan township on the semi-arid Absheron peninsula, 40 km away from Baku.It was a personal garden of Murtuza Mukhtarov, a tycoon and oil millionaire of his time around 1895-1920s. Currently, an area of the Arboretum is 24 hectares. The Arboretum is listed among the world's richest collections for the number and age of flora species. About 1,800 species including 1,540 plant types and breeds both from Azerbaijan and many other countries are being introduced to visitors.

The Nový Dvůr Arboretum is an arboretum in Opava District, Czech Republic. The arboretum is part of the Silesian Museum in Opava, and includes 7,000 different species from five continents, spread over 23 hectares. There are also 200 square metres of greenhouse space, including both tropical and sub-tropical climates, allowing the arboretum to also include trees and plants that require the climates of Africa, Asia, America and Australasia.

Sevan Botanical Garden, is a botanical garden founded in 1944 in the northern Armenian town of Sevan, near the Tsamakaberd neighbourhood. The garden is operating as a satellite of the Yerevan Botanical Garden under the supervision of the Armenian National Academy of Sciences.

The Sochi Arboretum is a unique collection of subtropical flora and fauna. It is a monument of landscape architecture located in the Khosta district of the city of Sochi, Krasnodar Krai, in Russia. It includes 76 species of pine, 80 species of oak, and 24 species of palm.

Officially Sochut Dendropark named after Edmund Leonowicz, commonly knowns as Stepanavan Dendropark, is an arboretum located near the Gyulagarak village, Lori Province, Armenia. Located around 85 km north of the capital Yerevan, the park was founded in 1931 by Polish engineer-forester Edmund Leonowicz. The arboretum is 35 ha in total of which 17.5 ha consist of natural forest and 15 ha of ornamental trees.

Stromovka is a large park in the Bubeneč district of Prague. It sits on the floodplain of the river Vltava. At present, it spreads over an area of 95 hectares. It was established in the thirteenth century as a game reserve for the nearby summerhouse. At the beginning of the 19th century, it was converted into a park, which later in the 19th and 20th centuries was reduced by the construction of railways, the building of the Academy of Fine Arts and the Planetarium, a ship canal, and last but not least by the construction of the exhibition ground. The park is maintained as an English landscape garden. It is protected as a natural monument as well as a cultural monument.

The Tokai Arboretum was the first large-scale silviculture experimental station in Cape Town, South Africa. The area of the main Arboretum, at Tokai Park, is 14 ha. Several adjacent compartments extend the area to 26 ha. The Arboretum was declared a National Monument in 1985, on its 100th anniversary. It contains stands of Eucalyptus and other trees from the original silviculture experiments in South Africa. In the 1990s a Gondwana Garden was created to display the plants typical of the Cape 100 million years ago.

A tree cathedral is an arboretum laid out so the arrangement of the trees creates the typical architectural elements of the nave, chancel, and transepts usually constructed from masonry in a typical medieval cathedral.

The Villa Belvoir respectively the Belvoirpark is a Cultural Heritage in Zürich-Enge that comprises the mansion built between 1828 and 1831, and one of the largest public parks and arboreta in the city of Zürich in Switzerland.

The Volčji Potok Arboretum was opened to the public in 1952. It originally formed part of the Souvan family estate in 1885, which was taken over by the University of Ljubljana in 1952 and legally declared a place of cultural and natural heritage of national importance. Now independent of the university, it is the most visited botanical garden in Slovenia and in recent years has become well known for its spring flower shows. The arboretum is primarily a botanical garden for woody plants, the only one in Slovenia.

Arboretum Wespelaar is an arboretum in Wespelaar, Belgium.

The Zirc Arboretum is an arboretum in Zirc, Hungary.