Trelew (Spanish pronunciation: [tɾeˈlew], from Welsh: tref "town" and the name of the founder, Lewis Jones) is a city in the eastern part of the Chubut Province of Argentina. Located in Patagonia, the city is the largest and most populous in the low valley of the Chubut River, with 97,915 inhabitants as of 2010. The Trelew municipality is part of the Rawson Department, whose capital, Rawson, is also the provincial capital.
Trelew is an important commercial and industrial centre for the region and is the main hub for wool processing, accounting for 90 percent of activity in Argentina. The produce of this industry is mainly shipped and exported through Puerto Madryn and Puerto Deseado.
Trelew is home to the Museum of Paleontology Egidio Feruglio, showcasing the paleontological heritage of the Patagonic region, and considered one of the most important of its kind in South America and the Astronomic and Planetary Observatory.
The city is served by the Almirante Marcos A.