An ibex (plural ibex, ibexes or ibices) is any of several species of wild goat (genus Capra), distinguished by the male's large recurved horns, which are transversely ridged in front. Ibex are found in Eurasia, North Africa and East Africa. The name ibex comes from Latin, borrowed from Iberian or Aquitanian, akin to Old Spanish bezerro "bull", modern Spanish becerro "yearling". Ranging in height from 70 to 110 centimetres (27–43 in) and weighing 90 to 120 kilograms (200–270 lb), ibex can live up to 20 years. Two closely related varieties of goats found in the wild are not usually called ibex: the markhor and the feral goat.

A male ibex is referred to as a buck, a female is a doe, and young juveniles are called kids. An ibex buck is commonly larger and heavier than a doe. The most noticeable difference between the sexes is the larger size of a buck's horns. The doe grows a pair of smaller, thinner horns which develop considerably more slowly than those of a buck. The ibex's horns appear at birth and continue to grow through the rest of its life. Species of wild goats that are called ibex are:

• The Asian ibex also known as the Siberian ibex (Capra sibirica) is a wild goat inhabiting long mountain systems in central Asian deserts and the northwestern Himalayas. The animal is 80–100 cm high at shoulder, and weighs an average 60 kg. The adult males have long pointed beards and scimitar-shaped horns with prominent ridges on the frontal surface. The coat is dark brown with greyish underparts, and a dorsal stripe runs from the neck to tail. Adult males also have grey saddle patches on their backs. The species exhibits sexual dimorphism, as the females are smaller with small straight horns that are widely separated at the base. Asiatic ibex is widely distributed over an area stretching from the Hindu-Kush Mountains in Afghanistan to Sayan Mountains in Mongolia. The animals are found most frequently at elevations ranging from 3000 to 5300 m above sea level, but are also known to occur in areas as low as 1000 m in the Altai Mountains. They have a predilection for rugged terrain as an anti-predator strategy.
• The Alpine Ibex (Capra ibex) is found in the European Alps. Alpine ibex are found in France, Bulgaria, Austria, Switzerland, Italy, Germany and Slovenia, and have been introduced to ranches in the United States, Canada and Argentina.
• The Iberian ibex (Capra pyrenaica), formerly called Spanish ibex, is restricted to mountainous enclaves of the Iberian Peninsula, in Spain, Portugal and including in the French Pyrenees, but in the past it also occurred in southern France. There are approximately 50,000 Spanish ibex on the Iberian Peninsula. Two of its subspecies went extinct, although one, the Pyrenean Ibex, was cloned in 2003 but the resulting individual died very quickly.
• The Nubian ibex (Capra nubiana) occurs in the Middle East, in the Red Sea hills of Sudan as well as the highlands in Egypt. They are the smallest ibex species and adapted for arid environments with a tan color, white underbelly and rump, black legs, and dark tail. This species is Vulnerable, with less than 4,500 individuals in the wild. The population is declining through most of its range.
• The Walia or Ethiopian ibex (Capra walie) is found in the Semien Mountains of the Ethiopian Highlands, where it has recently been upgraded from critically endangered to endangered. It is sometimes considered a subspecies of Alpine Ibex. The Ibex was also a national emblem of the Axumite Empire.
• The wild goat (Capra aegagrus), also known as West Asian ibex, is found in Turkey and the Caucasus in the west to Turkmenistan, Afghanistan and Pakistan in the east, and is the ancestor of the domestic goat.