El alambre de púas, alambre de espinos, alambrada o alambre de bambua es uno de los tipos más elaborados de obstáculos militares de alambre. Las barreras de alambre de espino pueden llegar a tener varios metros de grosor y altura, formando una tupida malla de alambre con púas. Este tipo de alambradas fueron descubiertas accidentalmente al juntar en poco espacio restos de alambradas tradicionales dañadas por ataques de infantería. Hoy en muchos lugares del mundo este alambre se utiliza para dividir fronteras o cercar lugares restringidos evitando así la entrada de intrusos. El estilo más moderno de este tipo de alambres usa unas láminas afiladas de alambre, soldadas a un alambre. Las alambradas de púas, junto con las ametralladoras, fueron las responsables del gran número de bajas en la guerra de trincheras de la Primera Guerra Mundial.

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Barbed wire, also known as barb wire, less often bob wire or, in the southeastern United States, bobbed wire, is a type of steel fencing wire constructed with sharp edges or points arranged at intervals along the strand(s). It is used to construct inexpensive fences and is used atop walls surrounding secured property. It is also a major feature of the fortifications in trench warfare (as a wire obstacle). A person or animal trying to pass through or over barbed wire will suffer discomfort and possibly injury. Barbed wire fencing requires only fence posts, wire, and fixing devices such as staples. It is simple to construct and quick to erect, even by an unskilled person. The first patent in the United States for barbed wire was issued in 1867 to Lucien B. Smith of Kent, Ohio, who is regarded as the inventor. Joseph F. Glidden of DeKalb, Illinois, received a patent for the modern invention in 1874 after he made his own modifications to previous versions. Barbed wire was the first wire technology capable of restraining cattle. Wire fences were cheaper and easier to erect than their alternatives. (One such alternative was Osage orange, a thorny bush which was time-consuming to transplant and grow. The Osage orange later became a supplier of the wood used in making barb wire fence posts.) When wire fences became widely available in the United States in the late 19th century, they made it affordable to fence much larger areas than before. They made intensive animal husbandry practical on a much larger scale. An example of the costs of fencing with lumber immediately prior to the invention of barbed wire can be found with the first farmers in the Fresno, California area, who spent nearly $4000 (over $75,000 in present-day dollars) to have wood for fencing delivered and erected to protect 2500 acres of wheat crop from free-ranging livestock in 1872.

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