Aigle (415 m) in Canton Vaud has an extended industrial and business zone on the valley floor as well as vineyards on sunny slopes. In the 18th century, Aigle profited from rich subterranean salt deposits. However, this operation moved permanently to neighbouring Bex in 1798.

Three narrow-gauge lines of the Transports Publics du Chablais start at the Aigle SBB railway station: the 6.3 km long Aigle-Leysin cogwheel railway, the Aigle–Ollon–Monthey–Champéry line, which also has several cogwheel sections, and the Aigle–Le Sépey–Les Diablerets line. An extension over the Col du Pillon to Gstaad connecting to the Montreux-Berner Oberland Railway MOB has never been realized.

Aigle developed into an important commercial town thanks to its position on the trading routes into the Valais and over the Great St Bernard Pass. The showpiece of the tiny town, which in medieval times consisted of seven quarters, is the Quartier du Bourg with its picturesque narrow lanes and houses built closely together, some with adjoining arcades.

Aigle’s most famous building is its castle in the middle of the vineyards. The castle has a wall with three round towers and a battlement parapet. The oldest part is the rectangular keep. In 1475, during the Burgundian War, the Bernese succeeded in taking possession of the castle: in the process the stronghold was almost destroyed but was rebuilt from 1482-85 and used as the seat of the bailiff until 1798. The castle is now a wine museum (Musée de la vigne et du vin et de l'etiquette) and well worth a visit. Next to the castle stands a large tithe barn (Maison de la dîme) dating from 1587.

Aigle is the seat of the International Cycling Union (UCI) and also has a velodrome with a 200 metre track and other facilities for cycle sport. The Canton Vaud town also has a rope park (Parc Aventure) and the Fondation Hervé Automoblile Museum with several rare vintage vehicles.