ARB, ARb or arb may refer to:
Arbor Day (or Arbour; from the Latin arbor, meaning tree) is a holiday in which individuals and groups are encouraged to plant trees.
Arbitration, a form of alternative dispute resolution (ADR), is a technique for the resolution of disputes outside the courts.
In economics and finance, arbitrage (US /ˈɑːrbᵻtrɑːʒ/, UK /ˈɑːbᵻtrɪdʒ/, UK /ˌɑːbᵻtrˈɑːʒ/) is the practice of taking advantage of a price difference between two or more markets: striking a combination of matching deals that capitalize upon the imbalance, the profit being the difference between the market prices.
An arbuscular mycorrhizal fungus (plural mycorrhizae or mycorrhizas, a.k.a. endomycorrhiza, AM fungi, or AMF) is a type of mycorrhiza in which the fungus penetrates the cortical cells of the roots of a vascular plant.
Arbroath or Aberbrothock /ɑːrˈbroʊθ/ (Scottish Gaelic: Obar Bhrothaig, [opəɾˈvɾo.ɪkʲ]) is a former royal burgh and the largest town in the council area of Angus in Scotland, and has a population of 23,902. It lies on the North Sea coast, around 16 miles (25.7 km) ENE of Dundee and 45 miles (72.4 km) SSW of Aberdeen.
Arboreal locomotion is the locomotion of animals in trees. In habitats in which trees are present, animals have evolved to move in them.
Arbovirus is a term used to refer to any viruses that is transmitted by arthropod vectors. The word arbovirus is an acronym (ARthropod-BOrne virus).
Arbëresh (also known as Arbërisht, Arbërishtja or T'arbrisht) is an ethnolect spoken by the Arbëreshë, the Albanian ethnic and language group in Italy.