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Éragny (eʁaɲi; sometimes unofficially called Éragny sur Oise e.ʁa.ɲi. sy.ʁwaz) is a commune in the northwestern suburbs of Paris, France. It is located from the centre of Paris, in the "new town" of Cergy Pontoise, Val d'Oise, created in the 1960s. Inhabitants are called Éragniens (masculine) and Éragniennés (feminine). In 2018, the commune had a population of 18,162.

The population figures show very light growth the 30 last years after the very strong growth of 1975/1982. By contrast, Cergy Pontoise, over the same period a growth of 16.16% posted (1,049,598 into 90, 1,105,464 into 99), showing that the area is still in fast progression. The current density (of 1999) is of 3,588 inhabitants by km2. It very in a decade of that of Paris (of less than 10,000 inhabitants/km2 in the 1st with more than 40,000 inhabitants/km2 in the 11th, given in 1999), and with the top of the average density of Île de France (900 inhabitants/km2), which is normal for an urban zone.

Situated on the Oise river, Éragny remained a small village until the 20th century. Its original inhabitants probably settled around the town's fountain during the Roman period and named the place Heriniacus or Areniacus. The site changed names several times over the following centuries Eraisgny, Eraigny, Erargny, and finally settling on Éragny by the 10th century. Local quarries have yielded stone tools from the Lower and Middle Palaeolithic. Éragny and Conflans Sainte Honorine (Yvelines) were once a single parish, with Éragny the main settlement. Documents from around 1100 AD spell the name as Herigniacus or Erinniacus. In the early 12th century the vicomte de Pontoise, Raoul Deliès, gave a church dedicated to Saint Germain of Paris to the Cluniac Priory of Saint Martin des Champs. In 1868, almost half of the territory of Éragny was detached and became the commune of Neuville sur Oise. With the arrival of the railroad started the exploitation of quarries used until then for local needs. The rise of the ville nouvelle of Cergy Pontoise, at the end of the 1960s, led to the town's population to mushroom. Many streets were born on what is called "le plateau" and Éragny took today's aspect with about 16,000 inhabitants loving their good living town.

Éragny is served by Éragny–Neuville station on the Transilien Paris – Saint Lazare suburban rail line.

Samuel Paty, middle school teacher killed and beheaded in 2020 in Islamist terrorist attack.