La bicicleta de montaña o bici de montaña (en inglés, mountain bike, MTB) es un tipo de bicicleta diseñada para viajes en montañas o campos. Se le denomina, en castellano, bicicleta todo terreno (BTT) (del francés: Vélo Tout Terrain (VTT), o bicicleta montañera, como se le conoce en Perú, República Dominicana y en otros países hispanoamericanos. La bicicleta de doble suspensión representa el más importante avance del ciclismo en el siglo pasado; ya que proporciona a los ciclistas la posibilidad de llegar a lugares que en otro tiempo se consideraban inaccesibles para dicho vehículo. Mejorando la maniobrabilidad y control en terrenos irregulares, A través de ella han aparecido nuevas modalidades de ciclismo, acercándola hacia el campo de los deportes extremos.

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A mountain bike or mountain bicycle (abbreviated Mtn Bike, MTB; or ATB, for all-terrain bicycle) is a bicycle designed for off-road cycling. Mountain bikes share similarities with other bikes, but incorporate features designed to enhance durability and performance in rough terrain. These typically include suspension on the frame and fork, large knobby tires, more durable heavy duty wheels, more powerful brakes, and lower gear ratios needed for steep grades with poor traction. Mountain bikes are typically ridden on mountain trails, fire roads, logging roads, single tracks and other unpaved environments. These types of terrain commonly include rocks, washouts, ruts, loose sand, loose gravel, roots, and steep grades (both inclines and declines). Mountain bikes are built to handle this terrain and the obstacles that are found in it like logs, vertical drop offs, and smaller boulders. Since the development of the sport in the 1970s many new subtypes of mountain biking have developed, such as cross-country (XC) biking, all-day endurance biking, Freeride-biking, downhill mountain biking, and a variety of track and slalom competitions. Each of these place different demands on the bike requiring different designs for optimal performance. MTB development has included an increase in suspension, typically up to 8" or 203mm, and gearing, up to 30 speeds, to facilitate both climbing and rapid descents. However, advancements in sprocket design has recently led to the "1x (pronounced one by)" trend, simplifying the gearing to one Chainring/Sprocket in the front and multiple sprockets on the rear of the drive train, more commonly, 9, 10 or 11 .

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