The CASA C-101 Aviojet is a low-wing single engine jet-powered advanced trainer and light attack aircraft designed and manufactured by Spanish aircraft company Construcciones Aeronáuticas SA (CASA).

The C-101 was developed in response to a Spanish Air Force requirement. During 1975, CASA commenced work on what would become the C-101. In addition to its own design team, technical assistance was provided by Germany's Messerschmitt-Bölkow-Blohm (MBB) and America's Northrop. During June 1977, the first of four prototypes performed the type's maiden flight. The design was somewhat reminiscent of other jet trainers of the era, such as the BAE Hawk and the Alpha Jet, but was less aerodynamically sophisticated, being equipped with an unswept wing. Performance of the C-101 during flight testing was reported in excess of predictions.

On 17 March 1980, the first examples were introduced to operational service with the Spanish Air Force, which would be the principal customer for the C-101. The initial model possessed only a limited weapons capability, this attack capability was expanded upon later-built aircraft.[2] Several models were exported to overseas operators; the C-101 has been adopted by the Chilean Air Force, Honduran Air Force and the Royal Jordanian Air Force.  In addition to its use as a trainer aircraft, it has been used to perform aerobatics; in the latter context, it has been flown by the Patrulla Aguila aerobatics team. As of 2019, the C-101 remains in service in the Spanish Air Force and several other countries.

In May of 1985, CASA unveiled a new take on the C-101 with its improved C-101DD product. The mark featured all-modern systems such as HUD (Head-Up Display), HOTAS (Hands-On Throttle and Stick) controlling, and improved weapons delivery/capability. Despite the added features, the product did not find any takers and was withdrawn.
Total production of all C-101 aircraft reached 166 examples.

Years Manufactured: 1977 - 1985

Platform Type: Fixed Wing, Trainer

Initial Maker: CASA

Final Maker: CASA